Technically, it isn't impossible but as explained it is far from perfect and/or too computationally intensive for the now and the magic translator you are looking for doesn't exist yet.
Don't loose hope and think outside the box. Could you find/build a MIDI controller that would allow you to somehow have the feeling of playing a guitar with all its expressibility?
Well, there might be, with some luck. Carla seems to accept (proprietary) Jam Origin MIDI Guitar 2. That's the best guitar MIDI device there is, as to state-of- the art at this moment in time. And, for me personally perhaps, my one hope. But then: Carla only accepts the sf2 format, apparently - which means that my sfz guitars and basses need to be rewritten in sf2, somehow. And I haven't got a clue how to bring that about, to be honest.
Am I glad to see you joining this fun!
I clearly remember you as the guy who found out, years ago, that Carla seems to run Jam Origin MIDI Guitar, at first glance. But since you didn't own a guitar, at the time, it's still unknown whether or not MIDI Guitar is actually operative, in Linux.
Sforzando is a freeware sfz sample player, modelled on the Aria engine. A quick search after already having posted the above, found this contribution, of some years in the past:
Sforzando runs well with Wine, in my experience, and I've also used it hosted by carla.lv2 [...].
This may be a clue that Sforzando, too, could work in Carla.
The advantage over Linuxsampler as an SFZ host is that it supports more of the SFZ2 spec (such as it is) which really means it support the SFZ keywords introduced by Sforzando. To some extent the Sforzando version of SFZ is the "industry" standard some it is useful to have it available to take advantage of the features of some SFZs which linuxsampler does not currently support.
Any more positive confirmation of this, perhaps, out there?