It is not weird suggestion. On Star Wars The Old Republic, you can summon a repair droid for you and for people in your party, even inside a dungeon.

BUT, I will agree with people who don't want it. This only makes the people being lazy. I prefer the crafter method.

A thing that can be interesting is the request repair (like request meld). If you have Grade X Dark Matter, you can ask for repair to a member on your party that have the enough level to repair. THat's actually more interesting that add a simple NPC inside because yes.

I can't imagine a thing like enter a Savage Alexader and have a guy in a corner "Psst, eh, you, want a mend?"