I think I will start with 2 top trump from hand. If the suit breaks 3-2, I'll leave the last trump outstanding and play a low club towards the J.
There are various scenarios that arise, but I can handle virtually all of them...I only fail if the diamond K is offside and clubs are vicious. I don't care about them ruffing a club, when the suit is 4-2, since they can't do it without giving me 1 club trick, and allowing me a spade ruff in hand....so I'd get 5 trump, 3 spades including the ruff) and a trick in each minor.
Of course, when clubs are AQ(x)(x) onside, this won't be a good mp score
If trump are 4-1, I don't think I want to leave the trump outstanding. I will pull all of them, pitching a diamond, and then lead a club.....if rho had the 4 trump, I lead low to the 10...if LHO had the long trump, I lead the J. Either club choice can be problematic. If clubs don't pan out, I will eventually fall back on the diamond hook unless something interesting arises.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari
Mbodell asks "Trick 1: ♠2, 4, 9, J What now? (Opponents playing 3/5 leads and standard attitude/count)"
IMO ♠J, ♠A, ♣K. If RHO wins and leads a ♦ then you finesse.