If you really wanted a simple adaptation, how about a probe assembly that's fixed to the airframe and fits into the existing boom connection?
Not necessarily simple Evan, just something that will retracted in the space available and be visible to the pilot when extended. And of course Western derived --
Most of the 'bolt-on' probes always look to me like the designers and engineers forgot something, or (as more likely the case) it wasn't a requirement when the aircraft was designed, then after it was like, 'err! we can't go anywhere without one'.
Much in case was the original Harrier probe, then they got a bit clever with the second adaption. The Lightning probe though was totally 'hind-sight' to me and looks quite ugly.
My AV-19 would be third generation (maybe forth) so I think the bolt-on or just stick-out probe would be a thing of the past.