There is lawnchair launcher

But it’s been abandoned for a long time now

It was a damn fine launcher

It’s still usable, might be worth giving a try

Use tiny11 builder from ntdevlabs on GitHub and Chris Titus’s windows toolkit (from GitHub too) to clean things up further. But if you are putting so much effort might as well use linux

That looks like Reimu

Deleting everything without archiving is a pretty destructive thing tho, atleast archiving the comments in some other website would be better