Hiya Mike,
Before I got an Indivision I was using a VGA 'TV Box' off eBay. These cheap ($30) boxes of tricks will convert a composite signal into something any monitor can display. The quality won't be great because it's using composite but it's still an option. You can even add an SVideo adapter to your Miggy and then feed that into the VGA box for a better signal.
For WB use you might even get away with a RGB-VGA connector if you use the VGA Only + Multisync drivers together.