honeywell galaxy flex 50 with 5800 series wireless sensors

Hi,
I am hoping there is a way to use 5800 series wireless sensors with the Galaxy flex alarm panel. The RF portal which is intended for use with flex operates with 868Mhz sensors but there is a very limited choice whereas the 5800 series are compact and include flush mountable door and window sensors. Is there a RF RIO or similar which will work with 345Mhz 5800 series sensors and communicate with the Flex panel?
I bought the flex to work with the Touch Centre Plus touchscreen display which looks quite modern and sleek, but hadn’t really appreciated that the flex system seems to be (nearly) obsolete. Maybe there is a third party solution?
Thanks for any helpful ideas.

Only the C076 RF RIO is compatible with the 5800 series. I've not tried this with the Flex, but it should work - downside being no panel diagnostics. Another option is to use the SelfMon vmod. If you have a battery backed mqtt server, then you can use any sensor compatible with MQTT (zigbee etc). A bit more convoluted, but does open up to other sensors.