Several comments:
I assume there is a toe link that was removed prior to the photo?
So the Citation front upright is inverted, and the shock-mount boss is bolted to the lower control arm. It appears it was heavily modified in order to get it to bolt on (shortened and welded on).
It appears the Citation has a 3-bolt bearing assembly? I wonder if just by chance this will match or can be modified so that a more common micro-stub bearing assembly (S10 for example) can be used instead that would then allow conversion to 911 CVs.
I'd need to ponder on this more, but as I see it right now, whole-sale removal and replace is needed for just about any improvement here, be it with unequal A-arm, or trailing link, or whatever. Based on the length of the lower arm, plus the inner lower bushing retainer length, and the already existing toe-link (I hope it had one), I'm not sure if you'd not be better going with a Corvette set-up. But I don't know how long the Corvette lower arms are though. Not sure if Dave Savage's rear uses them, but something like that might make sense after seeing what you've got.
Last thought (based on assumption that you've got some decent fabrication skills) is to fabricate an upright that is conventional in design of the 60's and 70's sports racer rear uprights (thus eliminating the toe-link requirement), but with a pinch-bolt assembly welded to the top of the upright to allow use of the current ball joint. This would allow you to get an aftermarket 930 CV micro-stub bearing assembly that would let everything bolt up, and I think, still use your existing arms.
If it was me though, I'd have to seriously consider gutting what I have, and starting fresh.