I'm on the wrong side of the planet for you but I have a brand new Keymatic impeller.

It doesn't look new as it has sat under our old house for some years, but it has never been fitted to a machine. I grabbed it when I found a spare parts shop with a couple of Keymatic bits left, about 15 years ago. It might have some slight surface rust to clean up on the shaft, I haven't looked at it for a while.

I also MIGHT have a spare keyplate. I'll have a look in the next while. A relative now lives in our old house and I can get access there, but maybe not immediately.  I'll chase it up.

If the pulsator is missing, are the other components there? At the pulley end of the pulsator shaft there is a "pulley" (drive block? not sure what it's called), a clutch spring, plastic cap and linkage to the solenoid that de-activates the pulsator. (from memory, when the solenoid pulls in it RELEASES the pulsator, ie: stops drive to the pulsator.) If any of these are missing, the pulsator drive won't work.

Personally I don't think that matters - I have used a Keymatic as my main machine some years ago, and the pulsator is a waste of time. It does almost nothing and the pulsator clutch is quite unreliable, so at least here in Australia the pulsator drive was often disconnected by servicemen.  This then led to the odd situation that the cottons wash had a lesser wash than the delicate cycle, so the serviceman would advice doing all washes on delicate. (On cottons, the wash was 4 minutes with pulsator, on delicates it was 8 minutes with no pulsator.) To get your machine back in action you could refit just the pulsator and fit the retaining pulley/drive block at the other end. Don't worry about fitting the clutch etc if you don't have them. All you need the pulsator for is to block water from running down the hollow drum shaft.

Anyhow, if I can find the bits and you cover the cost of postage, they are yours.

I'm pretty sure an old ad for Keymatics I have here somewhere mentions the possibility of upgrades  by releasing new keyplates as a feature of the system. However I know of only one such upgrade that ever happened - here in Australia, Hoover released a cold wash keyplate. I had one cold wash keyplate, but I don't remember if it had just one cold wash option, or whether the whole keyplate was various cold washes. I think it was just one cold wash option.

The earliest machines (3224?) had the green outer casing and a timeline progress indicator, and came with a solid black  bakelite keyplate for cold only fills and a solid red bakelite keyplate for hot or warm water fills.

The second series (3226?) had the white outer casing, blue metallic dashboard with circular progress indicator. They had plastic keyplates with black outer edges and a white centre square, hot / warm fill keyplate had red text on the white centre, cold fill keyplate had black text on the white centre.

the cold wash keyplate I had was black plastic plate with a pressed aluminium centre, the markings were painted on - from memory, black text on a green background.

I had several spare keyplates including one cold wash plate. I don't think I have disposed of them, but I can't find them.

I will go up to our old house in the next few days and have a thorough search under the house. I know there are some Keymatic parts there, but don't recall seeing keyplates recently. I know I HAVE seen the spare pulsator there.

Someone here has cobbled together one of those weird sump hoses out of other bits.

Today when scouring in my garage for Keymatic bits I found a spare hose for a UK Hotpoint front loader, the one with the "catch pot" at the bottom. I reckon that might form the basis of an improvised Keymatic sump hose. Only the bit that connects to the drum needs to be flexible, the rest could be made up from PVC pipe. I'm lucky, I still have a good sump hose, but it won't last forever.

Here are a couple of pics of the Keymatic pulsator, next to a Hoovermatic pulsator for comparison.

Note the Keymatic pulsator, on the right, has a longer, thinner shaft and smaller diameter.

Unfortunately, I can't find any keyplates. I have looked thoroughly and I just don't seem to have them any longer. I have one keyplate in the machine I have kept, but the spare plates I thought I had have evaporated.

Also the pulsator I found is NOT brand new. I must have swapped the new one on to a machine. It is however in excellent condition. No sign of wear at the bearing locations on the shaft. It had a few specks of surface rust on the shaft but I have cleaned them up now.