No, I think you want something to boost your bankroll and not just returns you something less than 2x your buy in. And how many tables can you play simultaneously?! , the action is cascading.You must play attention. In classic MTTs , SNG tournaments you can play easily up to 4.Many folds and some standards open raises , 3bet spots.
HU understanding is critical for a MTT player , imagine how much profit you will lose if you always finish in second place, the pay jump is huge between those two spots.
So yes play HU to improve your game but not for a bankroll building!