N leads:
DT C4 H9
taking the diamond ace now cannot hurt - and either a heart or a club return will lead to declarer scoring his 3 honor tricks and two trumps on crossruff, losing two more clubs in the end.
There is simply no way declarer could run his diamonds UNLESS the defender plays another diamond after taking the ace. Any other exit is perfectly OK, a passive small heart best because it is risk-free compared to clubs. Declarer can discard a club, cash two more winners, ruff a club in hand, but there is no way for him to get rid of J8 in clubs.
Leading a small club could possibly cost a trick as it drives out the king, another club is discarded on the heart ace and then a diamond played from hand and east's last trump overruffed. If the declarer now correctly leads low club, his jack will be high with a heart entry - so in this case it would be +1. But I don't think any defender will choose a lead like this when he SEES the AK
♥ bared in dummy.
So I would adjust 4
♠. (Declarer does not deserve more after after so CARELESSLY losing the spade two in first trick :-))