No extra effort needed, just program the systems in from the RRDB. The 500 will behave just fine. If using win500 go to page two extended settings and put a check mark in the box for "Enable Flex Step". Just in case your new rebanded system uses them.
If you want to monitor a trunked system which is MOT II, create the TSYS object, select MOT 800/900 as the Type; click on "Trunking Tables" and on the right where it says "Standard" band plans, select 800 MHz "Rebanded".
If the system is not P25 (it would help to know which one you are working with), and the warning has been posted on the database entry, then during the import, the web service should set up the trunking tables for you, assuming it is a MOT type.