Why not create a trust feedback thread on the reputation board? Since you literally said that you won't be opening any offers here on the forum. But then, the usefulness of the trustfeedback thread, is for people who would be interested in trading with you, to check out your offers over there on those p2p platforms.. I've seen some past similar trust feedback threads on reputation board, like this one @
My Reputation/trust thread though most of them are trades done on the forum, but since you are still a member I don't think it's going to matter much. Then from time to time, you keep updating it with your lastest feedback and also those who are interested would drop some on the thread as well
Nowadays the reputation board is swamped with "forum crimes", so starting "NotATether's reputation thread" wouldn't exactly be a good idea as it will quickly go off-topic.
Why? You have the reputation on this forum which is equivalent to the to the reputation you have on other platforms.
Because not all feedbacks are equal. If you go to my trust page, all the feedback is for small amounts. However, I have also done trades with hundreds of dollars on other platforms, so naturally those feedbacks would matter more to someone trying to buy/sell some product from me in Marketplace.