I have never, ever been asked/told by any manager to work beyond SRATCOH, or indeed to encourage anyone to work beyond it.
Form SRG1410(?) would have to be completed for any such occurrence. This, I’m certain, would prompt more regulator action than a contracted service which has to curtail operations due to unexpected short-staffing.
Many are in the fortunate position of never having been asked to break SCRATCOH but the regulator has made it known at my unit they consider SRATCOH as guidance only.
Unit management are expected to ask ATCOs to break it rather than close airspace.
I’d urge you to confirm with SARG and your unit management their views now rather than wait till it comes up.