The UDRX works from 430 to 450 MHz so line A isn't a problem. Bandwidth is less than 5% so you could just make it resonant at 440 and be done.
Here in Western Washington the Band Plan lists:
430.8000 - 431.0000 Packet radio
439.8000 - 439.9750 Packet Radio
440.7000 - 440.7750 Packet repeater outputs
440.8000 - 440.9000 Packet simplex
441.0000 National Packet simplex frequency
445.7000 - 445.7750 Packet repeater inputs
Which suggests centering at ~ 438
Of course if you choose to do D-STAR you could be pretty much on any analog voice channel or even one of the splinter channels between analog.
I wouldn't over think it too much,