What if you combined your final version with your interleaved approach to add the last two queens? I'm not sure what would be required to remove ambiguity, though.
The fucky thing is, hydrogen atoms are simple. Literally every other atom and molecule is just estimated based off of hydrogen because of how much harder it is to calculate.
I'm in the same boat. Wanted to do Bitwarden but their sign up process is garbage. It never sends me the confirmation email. If love to set up a keypassxc server, but didn't know about the frontend issues.
What if you combined your final version with your interleaved approach to add the last two queens? I'm not sure what would be required to remove ambiguity, though.