Can I apply for a Non-B Visa for business meetings in Thailand from China or Hong Kong?

Is it possible to get a Non-B Visa for a business meeting / conference from China or Hong Kong? It's not listed on the embassy websites like it is on the Helsinki Thai Embassy, for example:

"1. Foreign nationals wishing to enter Thailand for MICE purposes as “employees or contractors of an organizer of conferences or seminars” so that such conferences or seminars can be held, are regarded as “working” under Working of Alien Act B.E. 2551 (2008). They must apply for a work permit with the Ministry of Labour, except for cases in which such foreign nationals enter Thailand to work on necessary and urgent matters for a period not exceeding 15 days. In the latter case, they shall submit a Notification for Engagement in Necessary and Urgent Work Under Section 9 of the Working of Alien Act (Form WP.10)."