GL-X300B as a WLAN Client

I´m looking for a ethernet to 4G AND ethernet to WLAN device. The idea is to be able to use 4G or WLAN, and switch to this manually.
I’m considering the buy GL-X300B but I could not get a confirmation that this is supported. I know this is not available on the standard UI but would like to know if I can enable this using LuCi.
Is this supported?

If you can accept the Beta firmware 4.5.0 which is support

Thanks for the reply, but when I try to download it I get the error below:

This XML file does not appear to have any style information associated with it. The document tree is shown below.
<Message>The specified key does not exist.</Message>
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although I could not download the Beta firmware, I realised that the default firmware supports the full Openwrt and hence I was able to configure it as a WLAN Client using it.