sgminer-gm seems to be working fine with an old SA kernel both with RX 480 and with GTX 1060.
(Obviously, it's really slow and hardware monitoring is not available for the latter.)
Porting GG's kernel to sgminer-gm should not be that difficult if SA's kernel is already working.
Let's see if I can quickly hack up a new version...
Please, make yourself a favour and don't dig into sgminer. Even though it is a great multi-algorithm miner and also we at NiceHash support it for long time, it has too much legacy and is too bloated. It goes back to original minerd, through cgminer, into sgminer, with lots "ifs" inside. Modern algorithms and modern gpus need lightweight miners, and nhqminer is one of them, you're really welcome to try working on nheqminer (it can be easily extended with support for other algorithms, besides equihash).