I like it. My concern is steamrolling/blitzing, so each invulnerable station would probably need something like... a 24-hour responsored period once its support station infrastructure had been comlromised before shedding it's invulnerability. Also, only one station aegis could be in decay at a time for one faction, otherwise you could have 3 invulnerables in addition to your home base and have it all stripped in a single period by an aggressive foe with a super-titan. Such a buffer would be pointless. For buffered aegis to be meaning they'd have to be taken down in cascade.
In a case somewhere along those lines, there is clear benefit.
It would also become a budgeting issue for faction leadership because 3 buffer stations are great but if they keep your FP budget constantly on the edge, then when shit goes down your HB won't stand long alone, so 2 buffers and a full coffer of reserve FP to protect the HB would be better in that scenario.
Of course even safer might be bankrolling 200K FP to keep you HB safe... what everyone already does. Not entirely sure how this would not still be the safest/wisest option in 90% of cases.
In a case somewhere along those lines, there is clear benefit.
It would also become a budgeting issue for faction leadership because 3 buffer stations are great but if they keep your FP budget constantly on the edge, then when shit goes down your HB won't stand long alone, so 2 buffers and a full coffer of reserve FP to protect the HB would be better in that scenario.
Of course even safer might be bankrolling 200K FP to keep you HB safe... what everyone already does. Not entirely sure how this would not still be the safest/wisest option in 90% of cases.