What about ...
A possible BYOD policy might include the requirement:
"if you have compiled it yourself from scratch - it's more than welcome".
"It will still only be allowed internet access" is an optional afterthought.
Cheers
Jon
PS I do - compile my own OS n apps.
PPS I get to set the policy at my workplace
PPPS Sometimes people notice the policy and give a shit - oh well I have other layers to the security onion