There are things I agree with you on, and some I'm on the fence with.
I would agree with you on a torture test for any DG rifle to fix any possible issues.
Changing angel of ejection vs rotating scope, I'm going with rotating the scope for the simplicity, cost and it fixes the ejection problem.
As for changing the angle of ejection, you could just start over with a new action or rifle...possibly one with CRF.
It's much easier (and most of the times cheaper) to start closer to where you want to end up.
We all want to end up with DG in the salt and no one hurt.
Altering the angle of a push-feed action doesn't make it a CRF rifle.
It merely fixes the ejection issue and does nothing for controlling the next round into the chamber.
As long as I wasn't hunting DG, I would consider this just fine.
However, I would not hunt DG with a push-feed rifle and yes I would torture test the crap out of it.