How much experience should a voice surgeon have?

I can have an upcoming Wendler Glottoplasty in ~2 months which is covered by my healthcare (for free). However, the surgeon has only done this particular surgery ~20 times, and could not show me any before-after results (when I asked at consultation a few months ago).

He is an expert on vocal-related surgeries and has done a thousand surgeries of the vocal tract. So I figured I'd take the risk. But I don't know if that's enough? Should I worry?

Some background: I've practiced voice for almost 6 years now, and while I have all the techniques perfectly down, I've stalled on pitch a long time ago; due to either physical or mental limitations/exhaustion. So voice surgery has seemed like the only way forward for many years. But I also can't afford to go abroad and get it done by a more well-known surgeon.