Like @Randy_Cohen, I also let parts print and don’t get to them immediately so it isn’t much of an issue for me either. I enjoy people trying to improve our machines with their own ideas though.
I feel the resin on the build plate is irrelevant in this case as it is a simple and quick process to just scrape it into the vat as you remove the plate. Was that part of your 20%?
Say you printed a plus sign vertically, if you tilted it to one side, the resin will run off one side and accumulate at the intersection from the other side. Thus making it necessary to tilt it the other way and wait for runoff correct? Anything with complex geometry might lead to more time wasted fiddling with such a device.
Just creative thinking. Keep up the thought process.