Why would one want to shoot Ortho in the field? A blue filter with panchromatic film will do the same thing. This stuff can do nice tricks in the lab, though as you can safely handle it under red light.
I agree about the EI. If you want to shoot at ISO 200, get a film that is designed for it. Foma 200 is pretty nice film if you can get it, or you can shoot Tri-X at EI 200-250 if you adjust development accordingly.
the results of a blue filter with panchromatic film come close but are not identical to those of orthochromatic film.
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