The only way you are going to get a very hard, abrasion resistant finish is
to apply it yourself. NO finishes are made to be applied over the factory
finish. Factory finishes are very specialized (and usually proprietary) a
nd engineered to prevent things from sticking to them or penetrating them.
That rules out a top coat.
American cherry is a poor choice for flooring. There is a reason you see o
ak, hickory, ash, and certainly a plethora of South American hardwoods on f
loors. They are hard woods to begin with (as opposed to the softness of ch
erry) and their grainy surfaces hold finish well. American cherry is soft a
nd tight grained and does not hold heavy, "engineered for flooring" finishe
How soft is cherry compared to most white oaks? IIRC, the Janka scale show
s oak to be anywhere from half again to almost twice as hard. That should
be easy enough to look up, along with any other woods you are interested in
using for flooring.