BEagle:
who's teaching people to use still air planning at medium level if the wind is 'less than about 10 kts'?
The advantage of using MDR for pre-flight planning is that the techniques are then fresh if you need to plan a diversion. How many non-mil pilots have you flown with on refreshers or LST/LPCs who pre-plan with a wizzwheel and can still plan and fly a diversion properly?
AWL:
I wish you success selling your gadgets but they really aren't necessary. Anyone with a circular DI (or any other compass rose) can do all the drift/gs planning just by calculating MD (WSx60/TAS) and then visually using the DI to estimate the drift and T/HWC on any heading. It takes less than 30 seconds.
Having said that, one gadget which people who struggle with 2+2 find very useful for estimating durations is a scale with distance/time for different GS - Transair sell one but it's simple to make one.
HFD