I have a fast touring second hand bike of immaculate pedigree, and it came with 650B wheels. I have replaced the non-drive wheel with a hub dynamo built to 700c and that allowed me to use my preferred tyre of the Pirelli Cinturato TLR velo at 700x35. A heady mix of pretty good rolling resistance, width for comfort and stan protection. Riding will be all hard surfaces, very little gravel and no off-road.
The original tyres are the Compass Babyshoe Pass at 650Bx42. Comfortable for sure but if you enter a parish with a hawthorn hedge then I worry about walking home. I'd rather not rebuild a second wheel so the ask is for wide road tyres, decent visitation protection and at least 650x35 but ideally a bit more. Having looked at a couple of gravel tyres - e.g. Vittoria Tereno Zero G+ 20, the rolling resistance feels too high and the punĀ£$ure protection too poor. the Pirelli is in the sweet spot I'm looking for but I can't find anything comparable at 650B.