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Have you tested ion3 or other tabbed WM's? It's the best, for my needs. Very organized and clean. I recommend you check it, openbsd has it on packages. I think "doas pkg_add ion3" will do the job, then startx. It's not maintained anymore, though (the last effort to maintain it is called "notion", but I haven't tried to run the Lua code on openbsd yet).
Have you tried Coreboot with SeaBIOS? Some guys reported it's working on -current...