Maybe. Oh and your feared combo of discarding and summoning them already exists. Cards like morphing jar or card destruction etc. ring bell? These 3 cards don't have ruling about properly summoning them before resummon anyway. Somehow noone complains about this.
Ritual is a lot better as you need them in your hand/on the field, and as you said there are cards that can get rid of them from the hand to the grave easily already to special summon them.
The reason fusion is more op then ritual in this case is there are a lot more fusion cards that can be used to bring them from the deck, meaning it will be a lot easier to get them to the grave/banish so you can get them out again.
Maybe turn the monster into a nomi monster he is rather a big card to have come back for round two 😛