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Honestly I have no idea whatsoever to do that. It could certainly be done but is it worth the cost? That is the deciding factor I would think. The MRF5015 is a 15 watt device and costs $34.90 from RF Parts while the IRF520 costs just $1.95  from RF Parts. It's a no-brainer what the manufacturer is going to use as long as he can make it produce power regardless of the reliability under high SWR conditions.