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Ta @hippy I love a bit of under biking and as you, have ridden tons of miles on towpaths etc with 25s etc, but for this thing I want a BIG volume tyre that’s not too slow on the road, but there will be sand involved at some points. I’ve ridden on sand with both 650x47b and 2.1x27.5 and it was much easier on the fatter tyres. I don’t think it was the knobs that helped, just their size. So my thinking is a big 700c 29er slick would work well?
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On sand it's all about lower pressure and bigger contact patch. So, bigger volume tyres means you've got further to go. But how much riding on sand are you doing? Did you move to a beach house or something?
Plenty of 27.5" bigger tyre options if you wanna go huge. Then it's the frame that is the limiter.
I just rode 500km of shitty Wessex lanes using 28mm Michelin Pro Endurance, the same tyres that have done TCR etc. There's no real need to go for anything super durable unless you really don't wanna mend a puncture or you definitely will be on rougher stuff.
There's always a compromise somewhere but you can ride road bike tyres over a lot of stuff!