Your CI system should build every commit from scratch, then you detect the problem right away. And don't rewrite history on branches which other things refer to

Your CI system should build every commit from scratch, then you detect the problem right away. And don't rewrite history on branches which other things refer to, you are destroying the ability to check out old versions. I don't understand why you cannot add your own patches though? Just need to push your fork somewhere available and then ref that in your submodule?