Are there any suitable alternatives for OpenWRT? My huawei 4g router that i use over sim connection does not support OpenWRT or Tomato unfortunately...
Easy, get yourself a OpenWRT router, Xiaomi AX3200 is perfect, you need to flash it but there are many howtos.
Then, use Huawei as Modem, connected to LAN port.
If the Huawei has Bridge, great, if not, Double NAT but you get to control everything on OpenWRT.