As of the Campaign beta, there doesn't seem to be a way to transfer ships or admirals between fleets, which creates several issues; to which I've mostly ran into the Necron prologue.
- Due to the very high point cost of the Scythe Harvest Ship, upon reaching level 2 it is impossible to upgrade any fleet that doesn't have the cheapest LC - Cartouche, as any other variant exceeds the point limit disabling the purchase.
(I'd assume getting to level 3 would fix that with another +50 points, but this is rather dumb and not an excuse for not being able to swap stuff around)
So theoretically to upgrade Amarkun's flagship, I'd need to first purchase a cartouche, transfer the flag there, disband 2 jackals and the Khopesh cruiser he starts with. Purchase the Harvest ship and then either disband the Cartouche, or keep it and repurchase escorts as seen fit.
There's no other way around this issue; and it is a massive money dump, and early campaign money is scarce.
Purchasing a Scythe and then disbanding the Khopesh is not an option, and I cannot disband the Khopesh first either as it is the only line ship present in his fleet.
As well as not being able to transfer his escort ships to any other fleet present to temporarily free up points, or reshuffle the roster. Other than disbanding then and having 25% of escort/line ship value returned, which is a massive resource sink.
TLDR: Upgrading fleets with higher tonnages is stupidly difficult with nations that have huge points gap between the different tonnages as you can't transfer vessels around or temporarily "dummy purchase" a higher tonnage ship exceeding the limit if you only have a single ship in the fleet which combined exceeds the limit value.
Possible fixes :
Adding a way to swap ships between fleets.
Instead of having to destroy and rebuild everything an exchange between two fleets in the same sector takes place;
Allowing a "Warranted" purchase, if there is only 1 ship present in the fleet, the flagship ; and the points are restricting buying a vessel of higher tonnage, allow the purchase to go through with a "warrant" that purchased higher points ship takes the role of the flagship and the previous ship is either disbanded or moved to another fleet stationed in the sector, as long as there's no point restriction.