David:
Great question
As a former Bi-Kardan owner - two of them actually - I understand your quandry of trying to have the best of both worlds.
With that said - I currently have a Wisner 4x5 Tech Field - Relatively happy with it but it's not the same as the Linhof - Kind of like after using Leica for a while & using something else - just doesn't feel quite the same.
Like you - I have considered Ebony but it's out of my price range for now - I picked up a Szabad 4x5 recently that I'm in the process of restoring & I will say that although it's not light it feels like it may be what I'm after - the machining is great & it's got a feel that reminds me of the Bi-Kardan down to the release levers, etc. . It also has some nice features that I've not seen before such as a sliding tripod mount for the correct center of balance depending on the lens being used - nice touch. Not many of them out there but at this point it's my suggestion given your question.
My intention is to sell the Wisner once done.
I will say that in hindsight that the Linhof Bi-Kardan can be easily knocked down for field use & you may want to keep it in the event you are unhappy with any future choices.
Good Luck
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