Flexible wedge gate valves can be converted to solid wedge merely by filling the voids with weld and machine the wedge again.
Is this possible?
Assuming it's a really big valve, so just replacing it is not an option.
If the working fluid is water or something similar, you could fill the intra- wedge cavity with well fitted dried hardwood.  [ Some paper machinery knives are retained with dried ironwood wedges that will grip for decades if kept wet.
I shouldn't have to point out that if you make the wedge rigid, you may experience leakage or body distortion or wedge sticking problems that you didn't have before.
If I were a supplier in that situation, I would be offering to let them have the upgraded flex-wedge for the Solid wedge price.  I confess limited experience with Gate valves but I know NO advantages of a solid wedge over a flex-wedge.

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