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If the allen wrench is on the holder with the keys, it can't be used it to get other keys off. Because it's stuck there with the other keys.
Say I take my car to an auto shop. They need to keep it over night, and ask me to give them a key. I say "sure, got an M3 allen wrench?" If not I have to give them my whole set of keys.
Say I need to hand off a key to a relative or a baby sitter to get into my house. "Sure, you got an M3 allen wrench on you?". If not I have to give them my whole set of keys.
There are so many cases where you might need to give someone a key briefly.
The slotted hole for the allen wrench doesn't need to be perfect. It just has to be roughed in. Then take an appropriately sized drill bit to it, and clean it out.
All this being said, I really appreciate you posting your designs here. It's one of best designs as far as key rings are concerned. Thank you!