I've thought the same thing - break up the gemblo pieces into hexes, and then cut out a 11x11 or 14x14 section of the gemblo board to use as a base. I like the concept of actual hexagonal pieces instead of using go stones, as it emphasizes the connections.
You do not need BREAK UP or cut the GEMBLO pieces.
You just have to buy EXAGO:
In EXAGO all pieces are hexagonal with single number.
It is sold on Amazon and elsewhere: