As Gazza stated, in a Redundancy situation regardless of which haul it is purely on Seniority number as current agreements stand.
In a RIN in LH , SH can not be touched as per displacements, however the company could choose to make SH positions available to bid to as they did in the 767 RIN.
Its pretty cut and dry, I don’t believe a heavy CR will be pursued for pilots right now, (too expensive) they will prefer extended standown. Not ruling it out but training costs will be too high while no one in the world knows when LH flights will resume.
The other issue is an amendment to the EA, but that requires majority vote by members in that EA.
Or the nuclear option could be QF go to fair work to demand redundancy on fleet and rank out of seniority, which would be fairly unlikely to succeed seeing as they forced in the LH vote during the Virus period.