Just a word of warning, non Mods can't stop scamming, they can only assist in gathering evidence.

 

You'd be a good middleman.

 

Any Red or Dark Red Mods can be a middleman

 

Who else have access to /invsee command?

 

donor400s have /invsee, but only Red mods can edit inventories.
So technically TMods can be trade middlemen but they'd need to trade separately with each player twice.