I have been asking myself pretty much the same question and have also read Salvatore's comments. For the money involved, I think it would be a lateral move. I have 3 Linn lp 12s. The one I am listening to the most at this time is a Valhalla, Ittok LVII, Supex 900 Super, wall mounted on a Mana Acoustics shelf. I like it very much. I also think that what the Linn sets on is very important. I had a homemade steel wall mount once and I switched from a pine shelf to birch plywood and it was a huge improvement My other tables are a Valhalla, Akito, K18, and a 25th anniversary with Lingo, Cirkus, Akito II, Adikt.
I think you may be overly optimistic in thinking you will get $1300 for yours. The Rega/Linn combo, right or wrong, has bad press on the internet, and is bound to drive buyers away. I think what I might do would be to sell the Rega arm and get an Ittok LVII. I like that arm a lot more than either Akito. The Akito and the Rega look cheap by comparison. Salvatore also thinks it is a good arm. That change may do the trick, at least for a while, and I think that combo will be easier to sell. In the meantime , I would start saving money. The Well Tempered Amadeus might be one I would set my sights on. Good luck.