It would sound good

To me at least.
I love flats. Rounds are just too abrasive for me. I know it's a technique issue, and I currently have my fretted bass strung up with rounds, but I still prefer the thump of a good set of flats.
To each his own.
I gather from your question that you have one of these "modern" basses? If so, why not string her up with a set of Fender 9050's and report back to us on how it sounds?
I would do it, but neither of my basses could be considered modern
FF