They're unlikely to start using SAFE-T any time soon. There are two LC towns who decided to go on their own, which I'm sure you know are Schererville and Cedar Lake ("Southcom"). Everyone else is on LCPS P2.
There's plenty of interoperability between the two systems when needed. They must have a patch available because one night, CLFD were using Fire South on the LCPS network but they were still using their SAFE-T radios.
Same goes for task force units, although looking at RIDs I think there's a pool of handhelds they give out for SV and CL PDs to use when they're doing saturation.
