I also quite like the idea of an xEM + xM1 combination.
Gives you a rewritable LF + HF option, both older, cheaper and less secure than other technologies, which has the benefit of there being a great number of them out in the world 
increasing the use possibilitiesā¦
However the likely hood of a Flex EM is very low due to the size the antenna would have to be.
Check out this thread to explain why
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