I second the use of Envisalink with a DSC or Vista panel. You will have to install the Envisalink 4 module in your DSC panel but that is not difficult.
There are 2 Hubitat integrations for the Envisalink module, one that requires a Raspberry Pi and one that is native Hubitat. The native Hubitat is the one that I use. The native integration uses telnet and is a bit "chatty". To lessen the load on my C8, I installed it on an old C7 and used Hub Mesh to link the 2 hubs. I have had this running for a few years for a Vista panel and it works fine.
Here is the Envisalink site and the native integration.....
