While being good with hand tools, building guitars, or even violins is definitely an asset to working on basses, those skills alone do not make you qualified or knowledgeable enough to do bass work. Cutting a new bridge for a violin, double bass, banjo, or kozobas might all involve similar materials, tools, and steps, but they aren't just larger/smaller versions of the same task. A local luthier who works primarily on violins was approached to cut a bridge for a bass by a colleague of mine. The luthier assumed "I just need to make it a bigger version of what I do for violins" and the bridge turned out as a horrible mess. It warped within a month of being carved, and the bass sounded horrible. That is just one example that comes to mind where "good at fixing x" does not translate to "good at fixing y."
When it comes to converting a bass to a removable neck, I agree that it is a major surgery. There are a lot of dedicated bass luthiers and shops that do not perform that operation, or only perform it under certain circumstances such as a new build instead of a retrofit. Unless you have access to someone who does them on a regular basis, it is not something that anyone could do and if done poorly it has the potential to absolutely destroy your instrument. If your local guy isn't able to do it or has no experience with it, I would strongly suggest either finding a way to get to someone who does, or keeping you bass as it is.