It has occurred to me after reading some of the replies that the pro-xl series radios I'm talking about is the pro510,520xl. Not the 122 or any other.
I'm saying that I would have preferred ssb in one of these units if it was possible. Rather than the 980.
The 510/520 board and chasis won't support SSB. I would say the 122xl or Rat Shack variant would be as small and simple as it gets. Very well built radio's back in the day for SSB use. A Galaxy 979 might work well for you.