I've seen HDD window mods which look awesome, but you'd never really want to trust anything of importance to them afterwards.
This might be worth a shot if you truly do have access to a clean-room.
As for your actual question, aren't you taking the mountain to mohammed with that?
Why wouldn't you just take the controller boards and swap them rather than trying to swap incredibly delicate platters?
I can't say it has any chance of working, but you're missing one of the best things about dismantling Hard Drives - the ridiculously powerful magnets.