To be totally honest with you Steve (Although I think I've already mentioned it during the early days of Shaulanca), I've never liked the idea of using Corsair ID for such group, as you're not really a 'Corsair' group anyways.
Shaulanca have always been more of a 'Pirate' group to me who are close friends to Corsairs and help each other out whenever they can, so I'm all for switching all your ships to use Pirate ID instead of Corsair.
This however, will raise a major problem: Tech restriction.
Sadly, some people in this community - who happen to be leading figure of some of the major factions - have a 'Black & white' type of view over things, which might make things rather hard for you. What I suggest is, switching to Pirate IDs and approaching the Corsairs leadership like 'We used to be corsairs, but life-style of corsairs doesn't really fit our group, so we decided to become independet but we'll still help you whenever we can, so it would be nice if you let us keep our tech' - Something that doesn't sound like 'We don't like Corsairs and don't want to be corsairs anymore and we're sick and tired of being called cannibals, etc'. That might work if you manage to RP it out right, and even if doesn't, there's still a chance of getting ooRP approval from Sairs for your ships (Not much unlike the [RF] Hessian group), but yet again, if RPed out right.
If neither of these work, and if you still believe you should be able to fly with Corsair tech, you can wait for SRPs to re-open, and then request a SRP to fly Sair ships in your fleet, even if not approved by the elders (Not much unlike the VR- Hackers group). Same goes for the Osiris, there have already been two major pirate factions with cap ships as their Flagship (The Vagrant Raiders and Neo-Terran Front), and both had to request SpecOps ID for their ships.
In the end, although I don't want to sound like a 'RP-whore', but all I have to say about your situation is, anything is possible in this game if RPed out right.
But still, if you're not corsairs and want to go full independent, and nothing works out in your favor, you'll have to live with it and get Codie-Sabres just like any other pirate out there, which is rather meh, but the only way if you don't get permission (InRP, or ooRP) to keep your ships.
