Any experience with nvent/raychem senz wiifi thermostat?

Hello.

is there anyone with experience with senz wifi floor heating thermostat?

i have one (will soon be two) that i intend to pair with home assistant.
problem i have is to connect it to my wifi, looks like i have to enter the wifi key via the tiny touch screen and as far as i can tell it does not allow upper-case letters.
or is there some kind of trick to entering the wifi key that i have missed?

having to change the wifi key just for a floor heating thermostat is a bit stupid and something i want to avoid since that ssid is used several other iot and home automation related devices.

any advice?

/T