One sound designer (longtime user of LMMS, uses a FOSS plugin -- Zyn Fusion/ZynAddSubFX -- to make sounds) is Unfa (Tobiasz Karoń) . Might be a good match: https://youtu.be/cAo5dX0K2mk. I've personally hired Unfa for stuff in the past. If it's not a fit, he may be able to recommend someone in the community that still uses FOSS for these things.

> We should also consider what we would do if none of the entries is better than the current sound theme. You know, just to be safe.