An additional question about training at other Judo and BJJ gyms: BJJ and Judo in Thailand?

I totally agree, when in Thailand focus on practicing Muay Thai and you'll learn more from it than you could in two years back at home. It will completely transform your striking game and open your eyes to a different type of fighting then you're used to. Not to mention, it honestly doesn't take too long to pick back up on your Jiu Jitsu and your Judo after only having been gone a few months, especially since you'll still be in shape from training in Thailand when you get back to training at home. But if you absolutely must train in Jiu Jitsu and Judo while in Thailand, sure they have it there, oftentimes at the same camps as they teach Muay Thai in, due to the popularity of MMA nowadays. This is especially common at the camps which cater to westerners as they are oftentimes training in Muay Thai to complement their grappling or mixed martial arts training back at home, and like to see that the camps also teach grappling.