Originally Posted by
ED65
As far as I know there's no reliable way to consolidate bark and ensure it'll stay firmly in place. If you Google the subject you'll see many suggestions for hardening or toughening up bark, including using penetrating epoxy (expensive), wood hardener and one or more very thin coats of varnish. These definitely work to varying degrees, the same way they can on punky areas in spalted wood, but they won't do much of anything to reinforce the bond of the bark to the layer underneath.
How thin do you estimate the slab will be with the bark removed? It's understandable if you want it to look thick and chunky you'll lose that but I didn't think this was a specific aesthetic of tables for the tea ceremony.