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Hi Packhorse,
The bulletin I referred to states that all MK2+, MK16, MK18, MK18UL,MK 20, MK20UL sold after Oct 2000 are approved for Nitrox up to 40% straight out of the box, so I would think a conversion could easily be made for the same models, but I think the OP is interested in O2 SERVICE which means "oxygen clean" and safe for 100%. As DA points out, SP has only APPROVED the MK20 for that.
couv
Scubapro's Great Britain site lists the Mk 2 and Mk 25 Nitrox versions approved up to 100% O2. The US site however does not and currently neither of those nitrox models are available to US dealers.Google scubapro mk2 m26 and you will find plenty of places selling MK2's ready for 100% O2. SP APPROVED.