Ha, ha! You are actually not too far off the mark with your idea. Not sure if the "medics" have sussed out implanting a micro USB yet, though. A magnetic lightening port might be more suitable for an underarm location - gets a bit sweaty under there!
However, implanted ports are quite a common feature - usually located somewhere up on one of the pec' muscles. Pacemakers can be switched "on/off" by placing a donut-type magnet on the skin above the PPM, as can monitoring and remote control occur to PPM and defibrillator devices. So maybe some form of micro access port might not be that far fetched.
Keep taking your anticoagulant medications regularly and digoxin - it might not be good timing to experience an episode of AF when testing the maximum altitude your UAV can achieve.
