N.B.--the 914 and 911 (up through 1988) steering gear are interchangeable, and practically identical. And the VW 411/412 stuff as well. If you're going that direction, at least that'll give you more options.
Bump steer can be a bit of a tricky thing. You can actually fudge it to get toe change that you want during compression or rebound of the suspension, if you're careful. Or at least get something close to what you want. I have seen race car builders spend hours on working out the toe curves of their suspension and fiddling with the tie-rod mounting positions to get specific things to happen...
...Although that is hours that would probably be better spent actually getting the thing on the road, in this case...
-soD
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