I know it's less convenient, but there's dedicated WiFi hotspot devices that exist.

I considered getting a "dumb phone" and one of these devices because in some cases a tablet-style internet-only plan + pay-as-you-go minutes for the odd time I use a phone would be cheaper than a bundled smartphone plan.

At this point saving the $10/month isn't worth the hassle to me though and now I use Slack on my phone so damn much it'd never work :\