I had a lanyard sitting around doing nothing so knocked up a mounting lug for my controller. It’s recessed inside so you can still just about get the cable back in there to close the top down onto it.
It’d look better in black but I only had white filament left. 
Uploaded it to Thingiverse if you want to print one yourself.
Mods: I posted this as a separate topic as it’s not a purchasable item, but feel free to move it to the accessories thread if you see fit.