Thank you for feedback, and hope to see some updates on Patreon! I can also share source draft pngs/aseprite files I was experimenting on, if needed - just let me know.
Regarding incompatibility with RPGMaker - that's really strange, because as far as I've checked their documentation its autotiling is using pretty simple "corner sets", and first option that I posted should be perfectly compatible with it - just need to rearrange tiles into pattern it expects. Second option is a more tricky, yes - in Tiled terms (which I'm using to build map for custom engine) it is an "edge set", and probably is not compatible with RPGMaker.