I think you may be over complicating this slightly. Ali is a sell and Humphries is a buy. Going against the pack with Humphries has put you in this situation. Going against the pack again is very likely just digging the hole deeper.If I really scratch around there is one more option
Trade out Naufahu Whyte price $456K trade in Humphreys $488K
That will leave me chronically short of an edge
To remedy that either
a) Vaimauga to Kai O'Donnel (if he gets named tomorrow) he only got 37 points but better than what Vaimauga gets
b) Sell Longi and get Wong an Edge for the Roosters who averages 47 but has bad job longevity with Radley coming back.
New players often look at the players they want to buy and how to get them. Seasoned players look at who they want to sell then figure out the best way to use the freed up cash.