Yea, sealing tomo is a good idea especially if it has Kawa or inclusions.

I round off one corner aggressively, in a large arc, then just use that corner rolling around that radius. Make about a ½ inch bevel then knock off the corners for a large smooth radius, with a diamond plate or 220 wet and dry. Remove all sharp edges.

On your tomo, I would cut off that piece on the top of the first tomo photo, squaring off the large tomo. A hacksaw will do it easily.

Cut off the inclusion about a ½ inch left of it, lengthwise, (well clear of the inclusion). Then split the remaining 3X4 piece, so you end up with (2) 2x3 inch pieces that are clear.

Seal the kawa on all three pieces. I get wanting to use the lacquer. It all works.