I dont know if a such thing exists, but a mod that sells in the GP market

Shell Restoration-restores 5% hull a minute max 4 modules max cost 55 GP
maybe it will look like a repair nano but with more legs

If you care about stats like me then I would like this. But I think it would need to give some hull as well. Maybe 250 hull ea

-10000...
5% a minute is huge, then 20% for all 4 is even bigger, imiagine someone with say 100k hull, has all 4 mods, lets say for arguementts sake that hid max dmg per hit is 2k, so min 50 hits to kill, also assuming that you hit once every 2 seconds, you'd manage to get 30 hits in before it repaired by 20%, so he'd be down to 40k +20% of 100k = 60k, you'd essentially have to hit at max cap for 2 mins straight to kill someone no matter their defense. And thats only at 100k... whilts it is a nice idea, it is too OP as it would make even more people verging on invincible when they are online, and even possibly offline...
maybe 2% a min and max 3 mods at tops
or make it 10% recharge per hour with a max of 3, would make it a bit fairer...