another alternative is to use a small 10BaseT hub that also has a 10Base2 thinwire port to connect the empeg to your existing subnet. the hub would then act as a repeater/media converter. small hubs like this can easily be found for <$50.

this approach has a few advantages: you could take advantage of your existing DHCP, if you like; you wouldn't need a second NIC in your machine; and you would not need to make any routing changes on any workstations.

good luck,
--dan.