Although I like tethering as well, but can’t you guys just get an extra SIM for your normal plan? I pay $7 USD extra a month for another data specific SIM for my unlimited plan.
It's carrier dependent.
AT&T: $20/month to add to an unlimited plan
Verizon: $20/mo 5G or $30/mo 5GUW to add to unlimited plan, 50% discount with select plans
Google Fi (T-Mobile MVNO): free for up to 4 data only SIMs on Unlimited Plus and Flexible plans (used to be 10 free data only SIMs)
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