I have a Vista 20P panel with three 6160 keypads, and I’d like to upgrade them to 6290W keypads. Is this something I should hire a professional for or should I be able to do it myself? I’m very technical though admittedly more of a software person than a hardware person.

My understanding is that upgrading these will require adding an auxiliary power supply (the vendor I spoke with suggested Altronix Power Supply Charger, Single Output, 12/24VDC @ 4A, 115/220VAC, Supervision, BC300 Enclosure). This part makes me more nervous than the keypads, which I imagine is somewhat of a simple swap so long as I am able to shut down the power to the panel safely.

Anyway, I will watch some YouTube videos but wanted to get your perspective. Thank you very much in advance.
https://www.honeywellhome.com/us/en/products/security/security-systems/6290w-7-in-color-touchscreen-keypad-with-voice-6290w/

I have an insurance requirement to add centrally-monitored smoke/CO detection to my Vista20P. My understanding thus far is that the only way to do so is to install Honeywell 5800COMBO devices, which is unfortunate because:

1. They’re expensive
2. They’re battery powered—I’d be replacing existing smoke/CO detectors which are wired for power (but not tied into the security system for central monitoring) with these

Until I stumbled upon this thread: https://www.reddit.com/r/homesecurity/comments/pqw54x/vista_and_hardwire_smokeco_detection_options/

Which recommended this product: https://www.brkelectronics.com/us/en/products/alarms/accessories/rm4-120-v-ac-smart-relay-rm4/

Would this accomplish this goal?