Ajahn Sudhiro is Dhammayut I belive, see www.rightview.org
Other than that I don't think there is a Dhammayut monastery in Thailand setup for westerners anywhere near the degree Wat Pah Nanachat is.
I was at Wat Pah Baan Tat a couple of months ago and saw a couple of western monks.
I have also stayed at a couple of more rustic branch monasteries of Luangta Maha Boowa both about an hour from Udon Thani, but if you don't speak Thai you'll likely find it difficult, I'm happy to try hook you up though if you want.
"Whenever we feel that we are definitely right, so much so that we refuse to open up to anything or anybody else, right there we are wrong. It becomes wrong view. When suffering arises, where does it arise from? The cause is wrong view, the fruit of that being suffering. If it was right view it wouldn't cause suffering." - Ajahn Chah
"Remember you dont meditate to get anything, but to get rid of things. We do it, not with desire, but with letting go. If you want anything, you wont find it." - Ajahn Chah