According to the TM folks, there are 3,000 Bhuddists from 10 monasteries in Thailand that practice TM.http://www.tm.org/blog/meditation/buddhist-monks/
So it doesn't seem to be any conflict for the traditional Bhuddist monks. I wonder if they do TM and their traditional style of meditation as well. Does any one know?
1500 in Thailand, 1550 in Sri Lanka (allegedly, as there doesn't seem to be any independent confirmation of Rev Koji Oshima's activites in Thai/Sri Lankan news outlets). Unsurprising, given their agenda:
"In recognition of these great achievements, Reverend Oshima was honoured with the degree of Doctor of World Peace Honoris Causa, the highest degree bestowed by Maharishi University of World Peace. The text of the diploma refers to the techniques that Lord Buddha taught to experience Nirvana, and recounts how, with the long lapse of time, these techniques were lost to the world, only now being restored through Reverend Oshima's programme of teaching Transcendental Meditation, which gives the experience of transcending to Buddhist monks. In accordance with Maharishi's wishes, the Diploma was presented by the Shankara, the most senior monk in Thailand."source