you can get rid off second modem with the AT commands sent to the modem , here is a post for that.
Still that does not fixed the fact that modem is permanently turned off in windows and I cant turn it back despite it shows even signal
Did you managed to fix that?
edit
I accualy managed to get that working with following workaround, instead of installling SW generic drivers
I downloaded those from panasonic website Cellular (WWAN) Drivers and they work fine