Yes, you can set a chirp/tone. Each zone wired into the retrofit kit is the same as a contact sensor to the Ring alarm system.
Yes, you can mix the wired retrofit zones with wireless sensors in the same alarm configuration. In fact, the kits are sold that way.
Yes, you can configure wired sensors with second magnets and position the window sensor over that magnet to partially open. This has nothing to do with the Ring system. The Ring open window magnet is just a second magnet to position the window, which you old wired system could also have.