Heres a way in P2P, buy a Dragon 2h sell it in a shop where you other account is and then buy it with that account and sell it in the GE. I don't know if it would work with rune 2h's or rune scimis but its worth a try. Here ive listed some stepps.:
1.)Look for an Item which you can buy cheap in a shop, but which you usually wouldnt find in a shop. E.g you buy an item in the GE and sell it in a shop for the half ofit, then when you want to buy it back it is cheaper than in the ge but you wouldnt get the same amount that you sold it for back.
2.)Look for a shop where noone is exept you and your other account.
3.) sell your items to the shop.
4.) Buy them with your other account.
5.) Sell those items in the GE.
With this method you lose like 10-20% of the amount which you want to transfer but it works (because you need to but it from the shop back with your other account). Eg. You can buy a Dragon 2h for about 200k from the shop (I dont know the exact number) and then sell it for, lets say 1.5mil. So you lose 13% from the 1.5mil (I just did a rough calculation in my head so it might not be accurate).