Firstly, I think it is the Frimpong-Diaby combo that we would try to bring on board, as we have been very left sided for the past few years, which makes it predictable and much easier to defend against. My only question is whether they are not more of a counterattacking type of pairing, which isn't necessarily what ETH is trying to do, or maybe he wants the variety.
With regards to Sancho, I can see him playing more in the centre, where I think he would be more effective, playing in and around the centre foward (in an 8/10 role with Bruno, Mount and Eriksen). Although he has rarely found his best form at Utd, he is a massive talent who has shown moments of brilliance, and I still think he could come good in a more possession based team.
We would still have Amad, Pellestri and Elanga, who could all be sold. Then we are left with Rashford & Garnacho on the left, and Diaby & Antony on the right, with Martial & Hojlund through the middle. Obviously we would all love to swap Martial for Kane, but I would even bring in Gift Orban to give us a bit of an X factor and be less reliant on Martial (who can only get bought by Saudis based on his current wage).