I’ve been using the Orion Browser a lot recently. Each profile pretends to be its own app as far as I can tell. You get separated spaces for work and private a

I’ve been using the Orion Browser a lot recently. Each profile pretends to be its own app as far as I can tell. You get separated spaces for work and private and links open in the last used window. This might solve your issue of assigning multiple windows to different spaces.