To quickly summarise how I got here:
Elitewheels packed enough tape for two wheels, but the park tool video said to wrap the wheel with the tape twice, so I had no more tape for the front wheel.
I took it to the local bike shop where they wrapped it but it would lose air and I would have to pump it up every day (for three months)
I asked Elitewheels what tape they sent me, but it was out of stock. I found what I believe to be the exact same (it looks, feels the same, etc) but it is marked as Polyimide Tape, for electrical work.
So the point of my post is: you don't need to buy tubeless tape, I got a 33m long roll of tape that is perfectly good for my wheels. It maintained pressure, unlike the bike shop installed tape, and was a lot cheaper. Here is the listing:
https://vi.aliexpress.com/item/1005007555704603.html?spm=a2g0o.order_list.order_list_main.16.2c271802m6pSdh&gatewayAdapt=glo2vnmI got the 30mm wide tape for my 25mm internal width elitewheels ent-gravel wheelset.