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Forever Bright Trading is a reliable visa agent in HK who I have used in the past.
They claim to be able to provide M visas with the following information, which doesn't sound too onerous:
Document(s) required: Documents on the commercial activity issued by a trade partner in China, or trade fair invitation or other invitation letters issued by relevant entity or individual. The invitation letter should contain: a) Information on the applicant (full name, gender, date of birth, etc.) b) Information on the planned visit (purpose of visit, arrival and departure dates, place(s) to be visited, relations between the applicant and the inviting entity or individual, financial source for expenditures) c) Information on the inviting entity or individual (name, contact telephone number, address, official stamp, signature of the legal representative or the inviting individual)
They are very responsive by email. Write to them and ask if they are currently issuing M visas to Canadian passport holders and how long the process takes.