I didnt like the DOTM Vortex head so did some experimenting.
FoC Vortex head socket was too large - it's held on here by blu tac



A repainted CW First Aid head was just right for me. Might need to move the shoulders up a smidge in bot mode.
The head is a smidge too wide to allow full transformation. but I know what needs to be done and if it wasn't a limited release figure I'd do the mod.