I guess it depends on what you mean by tech gear.Most Japanese boats get freaked out at tech gear.
If you mean backplate and wing...that's not much of a big deal.
If you mean long hose setup, that is a bit shocking for some who have not seen it, but that is the same anywhere, potentially, even in the states.
Now if you mean double tanks and stages (which I doubt you are) that could certainly be problematic if you did not clear the EQ ahead of time. Since you are traveling, I'd guess you're not in this "boat".
What might be a bigger problem is a boat that would fit 10 divers. I dove there with Kim a few years ago and the boat we were in would have been tight with 10. They are basically all fishing boats. I am sure there are other ops/boats.
BTW...Kim's last post in this thread was 2005. I'm not sure if he is still active on this board. He used to also be active on the Dive Matrix, but I'm really not sure these days.
He was the only person I knew with personal experience in Sasebo.