Yes, I would have joined Toxic if it was GMK. I don't really care about the novelty keys and I don't like DCS, but I did like the colorway a LOT.
I was thinking awhile after you finished it up, I would offer a 'terminal' colorway with bright green on black, like old terminal monochrome. Kind of similar in some ways, but also different.
There is a ****ton more than 4 keys for ISO users. I know for certain 99% of ISO user don't want US ISO but their own correct languages. I am hellbent on offering as much languages as possible while keeping in a reasonable price. So most of the big languages except French should be more likely than not to get done. I am sure DE, ES, GB for certain, and the DK, JA, NO, SE/FI, IT, PT are pretty likely too, maybe a few more.