Having said this, I will now probably get a burning urge to write 100% sincere soulbond mpreg omegaverse, but I will try to fight it off.

Almost certainly! "I have no interest in..." usually leads to the thought, "Unless..." for me! Good luck in your brave fight!

but not completely un-sad because they have Regrets, and also because eventually they will die.

Yes, good stuff!