Dave
You can adapt theses lenses to the E-P1/PL1 as follows
LENS >> ADAPTOR - Zuiko to >> m43 (one adaptor) >> CAMERA
OR
LENS >>ADAPTOR - Zuiko to 43>> ADAPTOR 43 to m43 >> (2 adaptors) >> CAMERA
Ask your self is it worth it the 14-42 is really excellent and just as fast, will you get
more Legacy Olympus lenses eg the other faster Pen F lenses
Olympus Pen F - Wikipedia, the free encyclopedia
Some of the Faster Pen F are excellent but are not cheap on Ebay