Your current products do not work with current UK Honeywell alarm systems, in fact the only UK alarm system it works with is the DSC one and that is itself virtual unobtainable here in the UK.
I would love to use your product with a current Honeywell system but many years ago UK alarm companies moved to using (what they claim) is a far more secure system than what your product supports and what seems still fairly common in the USA.
Whilst this issue may not affect your USA sales market it might do so in the future so is there any chance of you updating it to work with more modern alarm systems?
Newer systems like current UK Honeywell ones and other brands do have APIs even if getting the information can be hard work. As an example the following site uses a Honeywell Galaxy (UK) api to allow integration via MQTT. They claim they can even create virtual alarm sensors linked to other devices and monitored via their solution in to the Honeywell panel.https://www.selfmon.uk/home
The following articles may also be helpfulhttps://www.thesecurityinstaller.co.uk/ ... -protocol/https://www.diynot.com/diy/threads/gala ... on.472784/https://github.com/dklemm/FlexSIA2MQTThttps://richard.burtons.org/2020/05/03/ ... -protocol/
I believe for UK Honeywell systems one approach is to use their building services management api which integrates with their alarm systems. However some other solutions use a similar keypad interface emulator like I believe you do although obviously somewhat different.