In light of story progression, amongst other factors, I really think this is a reasonable suggestion.
"Why" you ask? Well, here's some reasons:
1. Neph is huge and a nightmare to pilot through asteroid fields. And no, a JD is not the answer. Or, at least, shouldn't be.
2. The Neph is a colony ship, not a warship by design.
3. The Aquillon is a shadow of its former self. Launches 1 light drone, no class 8 turrets, reduced power core.
It is conceivable to construct a light BS based on the Aquillon's model. Remove any carrier-related details, give it a light BS power core, and adjust the hardpoints accordingly.
If need be, I'll donate creds to the ship modeler for his/her efforts.