4-wire components with retrofit alarm kit

As currently sold, the retrofit alarm kit, while a nice concept, is so anemic that its practicality is seriously impaired. Battery operated, it can accommodate only 2-wire alarm components, which all but limits it to door and window contact sensors. In order to do an effective takeover of a house with a pre-existing hardwired alarm system, there needs to be a way for it to handle 4-wire sensors as well. That way it can also handle motion detectors, glass-break sensors, smoke alarms, external sirens, etc. There already exist products on the market that can do this (such as the Konnected alarm panel), so it is not a question of the technology not being around. If I could find a third-party product that interfaced with the Ring system, I'd go with that, but I can't find any. Hence I'd like to request that Ring at least make a version of its retrofit kit that can incorporate both 2-wire and 4-wire components.