Admittedly, I haven't been back in AO that long, but I've seen this issue being bantered back and forth forever. I see a solution. It would require some code changes, but I think the results would be well worth it. It may have been suggested before, but I've not seen it. It goes like this:
1. Allow anyone to equip any piece of gear, regardless of QL.
2. If you don't have the requirements listed to wield, it performs exactly like the best one you could use with your current skills.
That's it.
Wield your ql 115 nova flow with your level 60 soldier, but it's only going to perform like a ql 115 when you're actually buffed and grouped with a trader who is wrangling you. The rest of the time, it's only going to perfom like the ql 95 one you actually meet the requirements for self-buffed.
Fair enough?