Yes I was crawling around in chase of MRF237 with no/little luck. But I've a couple of idle BLV80-28 VHF PA specific transistors laying around. It would demand a bit of engineering around PA stage and those transistors are meant to be C class really. It could be nearly as good as shooting flies with a cannon, but I wouldn't be myself if I wouldn't give it a go. Anyways it can end up as an solid exciter, if I'll get SD1127/MRF237 in the future.
I am not sure about the mixer block. I've got one second hand (I could get an SMD new one instead, silly me). But it was cheap and easily available ha ha ha.
For the time begin I stuck with BITX20, short of just one element 33-36V zener diode. And it seem to be much easier to get more "rare" components" than simple semiconductor....
Resistance is futile.