The 6600 is very flexible, and able to do split or shared I/F. DEMI used to sell them, now Q5 Signal, and there's always Keuhne if you have cash to spare and want a really good transverter. eBay has a number of Eastern European transverter kits available. I believe all have been well discussed here.
Do a search on the Community, and you will get a lot of advice.