I just checked the myrcm booking in site:
http://www.myrcm.ch/myrcm/main?pLa=en&hId[1]=com&pId[E]=6
(EOS rd3 is currently on page 7 where there is a link to race registration). It looks like the rc4 decoder will be used throughout the series so mrt transponders aren't supported. We *think* there is the option to get a good price on upgrading transponders at each round, or alternatively there are some good upgrade deals in the UK at the moment?