Yes, it's possible. Is it worth it, I don't know.
My car is a '94 live axle and has been converted to full upper wishbone and lower spherical joints but I didn't go wide track. I didn't do the work myself, Chris at the Seven Workshop did it for me so I don't know whether Arch did anything to the chassis to make the lower wishbone fit. You'll need a bolt on bracket fitted for the full upper wishbone.
Laurence