Interesting idea.

I assume you have to manually pump the lever to get it to feed oil on to the chain?

I think the can will clear the chain guard when the suspension is compressed.

One observation (not a criticism) is that because the oil is being delivered to the top (outside of the chain) centrifugal force will fling the oil outwards and straight off the chain. It won't penetrate the rollers and side plates.

Normally (with an off-the-shelf oiler) you would feed the oil onto the top of the lower chain run just in front, or at the bottom of the rear sprocket. This means that as the chain goes round the sprocket the oil is pushed from the inside through the side plates/rollers to the outside and then flung off carrying any dirt with it.

I think you'll find the set-up will be less messy and you'll get more oil onto the important bits of the chain if you can feed onto the top of the lower run somewhere near the rear sprocket.

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