I tried look around to see if anyone made such mod, I couldn't find any.

It would be cool to have npc offering Enchanter Service offer to "recharge" your worn enchantments or all or enchantments in your inventory. I think at rate of 1 coin per 1 charge would be good.

So, a faster rate for recharging, rather than waiting or wasting soul gems? I suppose that isn't a bad idea at all

Though I've never seen anything like that, so it is probably more difficult than one would suppose...

I've proposed this before. Would love to see it done.

That would cost a furtune to recharge an item like Staff of Magnus or Ring of Equity.

I think 1 gold per 10 pts magic charge is more realistic since the enchanting service for those NPC's who is offering it to the public is a little too expensive in vanilla.

Perhaps it'd be possible simply through dialogue? I'm not sure if there's a script for charging items, however.

I would like to see this done as well. But I afraid this would not be possible with vanilla scripting. Perhaps with MWSE.

I imagine the author of http://www.nexusmods.com/morrowind/mods/43977/? could know how to do it.

You need MWSE for this. Once you have a hold of the actual item reference it's fairly simple to do. Coming up with a good mechanism to select the desired item is the hard part, especially since you can't create custom soulgems.