2n Helios is an option
Its expensive like the DS2 but you can configure it. I mean I think you can configure the DS2 without a tech if you have Composer HE, but I have a 2n device and I have 100% control over it. If you want a lot of options, look at Holovision - they offer a SIP kit with 2n Helios so it works within C4, and then you can use a Holovision face plate + camera. They have tons of different types, some with built in IR's for better night vision, cameras that swivel, etc.
Well you could go with a Ring Elite - that would use the POE line already ran for the DS2 and wouldn't require batteries. The integration is limited, you can trigger events in c4 but you can't integrate video or use intercom anywhere.
If you buy the Ring Elite from me (or any other Blackwire based distributor) the $100 ring driver is included