Need to make a splined socket shaft

[Jonathan]

This is essentially an RFQ, but I'm posting it here since discussion is not allowed in that part of the forum.

I need to machine, or more likely get machined, a splined shaft for the motorbike I mentioned here. The adapter needs to be machined to fit on to a shaft with the following dimensions (highlighted in red), to enable adding a sprocket and additional bearing to the motor:



The only off the shelf part I've found that matches is this, which can potentially be adapted but it's not ideal as we need to fit a 17T, 1/2" pitch sprocket on the shaft, which is quite small. Another option is to use EDM, which is fine in theory but in practice I don't think we would get it made in time at university as the technicians are always busy and the first race is only 3 months away.

Companies contacted so far who have responded and said no:

Davall, Hayes Couplings, Bell Gears, Ondrives, Hiwin, Freedomengineering, Huco Dynatork, HTL, HPC Gears
Llewellin's gears said they could do it, but for over £1000 plus the cost of tooling, so that doesn't count.

Can anyone can point me to a company who could machine this?