Look, realistically, Alex G doesn't have a snowball's chance in Sarasota of coming, at least not yet (his last album reached only #32 in the charts - in Scotland). He has a growing fanbase but he's not yet at the same level of ubiquity as previous music artists that have been represented as standalones.
*But* - he's a great artist, he has his cult, and I think his music would fit with another IP/generic horror concept. If HHNH ever brings over e.g. Blood Moon or El Artista, his style of atmospheric, moody electronic music would really fit.
For now, I would think of him like Figure. He wouldn't be the standalone draw just yet, but he plusses up a concept. And if he does end up exploding at some point, then all the better to have already established a working relationship.