Thanks for the idea. I had a similar thought of splitting the resistance as you have suggested !
I don't have a working scope at the moment but I might be able to test this out by transmitting into a dummy load with the BITX40 and monitoring it with my Flex-1500 as there
is a "scope" display in Power SDR that might just let me see the shaping of the received waveform.
I'll do some experimenting and report back what I find.