A “spot narrow optic” is quite the misnomer. It is the spottiest among all optics in the Carclo 105** series, but objectively is still very floody.
A dedomed 519A would be a pretty good solution. The 10511 might play slightly nicer with the dedomed 519As, or you could get some weakly frosted tape for diffusion (which is what I do). The number of lumens is reduced compared to pre-dedome, but that is really a faulty comparison because lower CCTs have fewer lumens to start with. For example, a dedomed 519A 5000K is around 3600K, and thus should be compared to a 519A 3500K for output. The reduced die size upon dedoming may also increase the optical efficiency of the TIR. In short, lumens loss should not be a worry for dedomed 519A.