Sorry, I don't currently have the time to work on this project.
However, Bitsy HD is open source - so anyone can grab the code and make their own version. Another user did rebase it to the 6.0 version, but that version is untested. You can grab it straight from github and give it a spin https://github.com/Level0gamedev/bitsy_X2
If I hear that it works well enough from few users, I will be happy to put that version on here. Otherwise, I treat it as an experimental build.