“The cost of a handheld is small beer compared with running an aircraft, and could be a lifesaver.”
Yes, it is the replacement of the engine and the modified ignition system to make it usable which costs. I spent well over 100 hours and not insignificant amounts of money trying to suppress the ignition on my Nipper to allow the hand held to work. I could get the radio working perfectly, but at the expense if a misfire, or the engine working but the ignition drowning out the radio completely. Do not assume it is as simple as just putting a hand held in the aircraft…
Rod1