Hey, I think you should not excite the community with questionable promises, it isn't fair with them and you're just making a fool of yourself if you can't deliver it.
Updating the engine to UE5 does not solve anything by itself. If you don't (or try avoid) touch it, it will be looks as before and behaves worse than the previous one. (I know because I did a working ue5.3.2 version for myself) So the result are contrary, it generates even more problems and errors because the game version skipped ten (10!) root engine version upgrades and a lot of the engine's part are changed (depricated/obsoleted/replaced/revoked/upgraded) and the full code hierarchy must be fixed, replaced, or removed (not just the already known bugs). But I could write a whole page about it...
So from that what you said about your plans it seems to me you're over-ambitious with your ideas, either in fixing and either with your 'plannings', except if you have a ton of experience in c++ and UnrealEditor, and/or have backstaff behind you.
Anyway I wish you good luck for chasing your dreams!
And sorry to the optimistic enthusiasts! (I didn't want to ruin anyone's day with my comments on a hoax like post)