Max BR2 Pro - Preferred network at lower signal

Hello, we have Peplink Max BR2 Pro 5G. We provide bus connection between Czech republic and Switzerland across Germany and Austria. We use 4 simcards, some local, some in roaming.

We have a situation where we use Czech simcards in Austria when roaming and when crossing to Switzerland there is an even longer distance from the border, but the signal is very poor compared to the local Swiss operator.

Celluar 1:
SIM A: Czech SIM (in the Czech Republic and Austria as Roaming)
SIM B: Germany SIM (only in Germany)

Celluar 2:
SIM A: Czech SIM (only in the Czech Republic)
SIM B: Swiss SIM (Switzerland only)

So I would like to somehow set up the device so that if SIM A1 has poor quality, it will switch to SIM B2 which has perfect signal in that location. I know that other devices have been able to set these conditions, but I don’t see these options with the Max BR2 Pro 5G.

Also, in the case of roaming settings for SIMs, the selected countries have to be set using a numeric code, not from a menu. Would it be possible to fix this somehow?

Thank you for your help
Michael Zelenka