I'd convert it from a storm-bolter, you already have two barrels then. Trim off one of the barrels (or both if you have tubing to replace it with) and put a flamer-nozzle nex to it. Glue a fuel tank either on the bolter itself (looks unwieldy) or use guitar wire to link it to the backpack or a tank in his belt or whatever you think looks good.
And no, there is no combi-flamer in the commander box, but the combi-melta is probably convertable.
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