Thanks for the answers.
I went to the local metalwork shop and got them to cut me a 27mm spacer (for 73mm BB) out of 40mm by 3mm aluminium pipe. I painted it black and installed the motor.
The motor did rotate downwards initially but after I tightened the crap out of it it seems to be working fine.
Now I can use this motor on a wider bike in the future if I like