With the 13.7:1 motors, the hubs that Gimson sell go straight on and then it'd be a case of adapting a wheel to go onto the hub as myself and Madusa have done. However, the hubs sometimes don't quite stay on the shaft so you can drill through the motor shaft and then fit a nut and bolt to hold it firmly in place. I never had this problem personally but it works so I'll take it.

Planned deadline is the FW champs, I am determined to compete
That is definitely ambitious given that the championships are likely late August with the signups probably opening up fairly soonish (June I'd reckon).