Pending the arrival of a $10 pouch from CPF'er Wong (that fits the Lionheart), the stock pouch is fine for now. Not absolutely positive it'll fit, but from the quoted dimensions, it should work well. I suppose $10 for a $40 light might be somewhat questionable, but if it's sturdier, what the heck.
BTW, that's quite a trick set-up, eTendue.