Put a unit of Grotz in front of them, with a full three Runtherds. That'll give them a 4+ cover save and a screening unit for units that attempt to charge you.
When you want to flame someone, pull the Grotz back slightly, and move the Burnas through the gaps and into position. During the shooting phase you reverse the order, with the Burna Boyz flaming, and then the Grots running back in front to catch any charge.
Of course, you don't have to shoot all the Burnas, and doing so will probably deny you the charge anyways, but if you only fire several of them, then the remainder can use their Burnas as Power Weapons in the following combat.
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