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Replacement for MEK

Can anyone identify a potential alternative cleaning solvent for MEK in the following application:
A facility is trying to eliminate the use of MEK in cleaning, but has hit a snag in their screen cleaning (screen printing).  The inks they use are MEK-based and cannot be changed currently due to their government customer specs.  The MEK is wiped on an 8x8 screen.  So far, they tried ethyl acetate, but it dissolved the PVA in the screen.  Now they are trying acetone, but the employees complain of smell and health hazards.  Any suggestions on a solvent that is safe and could quickly remove an MEK-based ink without hurting PVA-based materials?
Thank you for any assistance,
Tammy L. Allen
Senior Environmental Specialist
Pinellas County Environmental Management
512 S. Ft. Harrison Ave.
Clearwater, FL  33763
(727) 464-4761
Fax (727) 464-3174
e-mail: tallen@co.pinellas.fl.us