The Quantum pickups are very good, I would try to make them work unless you need something fundamentally different. I don't have any experience with that bridge. I have had a handful of Fujigen Ibanez Sabres and they are good guitars. Mine all had mahogony bodies, and the ones I owned exhibited a wide range of tonalities. One of the ones I kept has a quilted Sapele top and honestly the guitar sounds like Basswood. They dont have great sustain which is probably a combination of the abbreviated body, bolt on, and floyd.
The defining characteristics of the Sabre, IMO is that its a decent sounding guitar that is also lightweight. I think mine with lo pros are around 6#, while typical super strat is around 8#. That can make a real difference if you are not a brawny manly man. But the sabres look kinda like a toy when I play them.
I didn't know they were making Sabres with ash now. I know that there are many varieties of ash, so I can't predict how the guitar will sound or how heavy it will be.