You are doing well. 64 is only required for more than 16 zones otherwise a Solution 16+ will be fine (and can also support prox-reader). Alternatively you could use a remote keyfob to open the door and it doubles as a portable panic button (and a great way to accidentally arm the system when you sit on it in your back pocket).
The Bosch's native IP system isn't great or widely supported (and it relies on PSTN as a backup) so you'd do well hooking a 3rd party IP communicator to it. Which one you choose probably depends on to whom you will entrust your monitoring as they're all relatively similar in function.
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