You won't. It can't stop rifle hordes, let alone with flamers.
Apart from that, what am I supposed to salvage if my opponent makes nothing but riflemen with bars and bazookas or flamethrowers? The dead or scorched bodies of my meatshield volksgrenadiers?
That's not a problem with okw, the problem lies in USF being way too strong right now, instead of buffing okw they should nerf usf to balance everything