I cant give you a technical answer as i dont honestly know for sure, but i'd be extremely careful as bench torches are designed to work primarily with natural gas and propane, meaning the materials used in the torch have a normal temperature tolerance.
the problem i see is the LP burning hot enough to heat your torch to the point of either damaging the delivery system, or possibly even heating the hose barbs and inturn melting your hoses.
it doesnt sound like a great idea to me, but i've given my two cents and i'm open to hearing the other side of the argument -- as it may work just fine and dandy!
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