Yup, that is what I meant by using them in a strategic way.
I dont want them to be a permanent fleet bolster, but more of a "we need more ship for the final push", or "these guys can whop the small vassal fleet while I take on the AE oposite it" kinda feel.
And they would not bail if you kept them paid(should be fairly expensive thou)
I was thinking similar to only be used for an important push or a desperate defence but more in slightly higher purchase cost but very high maintenance so you would never prefer them to having your own fleet