WWAN Profile setup

You can, but I do not see what you would gain from this.

The source looks good and I think that all relevant dependencies are already included in IPFire.

No, I do not live anywhere near there.

IPFire is great for that and of course you can connect multiple devices (phones, laptops, tablets, etc.) to the same “hotspot” paying only for one mobile contract.

I am sure we will get it to work.