Your average Zoner does not need a capital warship. They're in tight with the Order in case something goes horribly wrong in the Omicrons. They can go hide in Baffin if things get pants-soilingly bad in the Taus. The Sigmas are pretty close to the Omicrons. Same with the Omegas.
Now, add in the question of "who really wants to kill Zoners?" and you've led to the question, "do random Zoners really need battleships?"
No. They don't.
Of course, there are a couple official Zoner factions that could use one or two -- Phoenix and TAZ for example. Thankfully, TAZ already has an ID of their own. Phoenix doesn't, but they could get a SRP one if they wanted to.
"But what about the mobile Freeports, Kaz?"
The Jinkusu Juggernaut was designed as one. The Nephilim Dreadnought is not. Check the infocards. I think I remember one usage, maybe two, of the Jinkusu as a "mobile freeport". That's it. Everyone else used them for waving around like male-exclusive extremities or pewing nomads in the Omicrons even though they're not supposed to according to the ID.
Just remove them from the ID. A destroyer is plenty for your average Zoner.