@SkewedZeppelin could you please shed some more light on this?
Is there a technical reasons it won't be possible to use OpenVPN (if we say, compile the firmware ourselves and add the relevant packages), say due to package incompatibility or anything.
I know your stance on OpenVPN (and why wireguard is superior), but personally I have a colocated server and to access the management device, my hosting partner provides only OpenVPN to access that private network, meaning i don't have much choice in the matter 
With the understanding you're not offering to provide any support/guidance in getting OpenVPN working, could i just ask if you're aware of any obstacles one would face trying to getting it to work, say because of the way DivestedWRT is put together, packages it might choose to use, etc or anything?