Hypno Toad

I think a fatbike would make a good touring bike. It may be heavier and will roll slower than typical touring bikes. OTOH a fatbike will allow you to ride any road surface with confidence. I've been on long rides with my Pugsley when I'm happy to ride a rough gravel shoulder when the road is too busy, fast, narrow to ride pavement.

Look into tires, for touring you'll want something different than the typically fatbike tire, I ride Panaracer Fat B Nimble for gravel grinding. For example, Surly Black Floyd would be a good option for mostly paved roads. Spare tires/tubes are heavy, tubeless would be a good option (but a spare tube is still needed).

I'd also look for different bars, I can't do a full day on flat-bars, . I have Salsa Woodchippers, LOVE THEM! I have other riding buddies with Jones bars on their fatbike.

For reference, I've done a number of metric centuries, full centuries, and this was my birthday ride last year - 140 miles of gravel riding.

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Edit - afterthought: As a tall rider, you may want to look at a Krampus