I would take something like a CC1101 or ADF7023,
run it at 433 MHz, and down/upconvert your band
to there. TI makes a chip with a LNA and transmit
amp built into the same chip with a cheap switch
to share the antenna that you could use as a front
Analog devices has some PLLs with onboard
VCOs that could be the LO, or you could use another
one of those transceiver chips just as a cw LO.
The only tricky thing is the input bandpass
filter, as it is not a common band. maybe make a
simple lumped element BPF since it is not a hard
reject band for image suppression.