I don't know of a way to convert all CMYK text in Acrobat to 100% K. Your best bet is to get the client to spec the type with the proper color, recreate the PDF file and send the new file to you for output.
ted
The author of numerous books on Acrobat, Photoshop, Illustrator and the Adobe Creative Suite, and an international speaker on Adobe Acrobat, Ted Padova is a well-known PDF guru.
I had this problem today, and it looks like doing a color conversion works in Acrobat 7 Pro Mac. Tools > Print Production > Convert Color > destination Space Gray Gamma 2.2 (or some gray space.) Preserve Black, Don't Embed Profile. Output Preview confirms black only.Mark Godfrey, Carpintera, CA
ted
The author of numerous books on Acrobat, Photoshop, Illustrator and the Adobe Creative Suite, and an international speaker on Adobe Acrobat, Ted Padova is a well-known PDF guru.