Claiming Electron u270 from USA

Hello, I have several Particle Electrons (model U270) that I’m trying to setup in the US and ship to a client in Africa. I understand that this model will not connect to the 1900MHZ 3G networks in the US, but I was hoping to be able to add the devices to my account prior to shipping them overseas. I came across a helpful forum post that explains how to flash firmware and activate my Sim Cards (How to activate Electrons w/o cellular connectivity), but, since this post is a few years old now, I was wondering if there’s been any change since it was written, or if there’s any new workaround I could use to add my devices to my account.