I know the last individual I came into contact with (quite recently FWIW) who did that sort of commute with BA was very very diligent in making sure he was compliant with EASA/BA regs. Must have been darned tough on his home life but horses for courses I guess, plus a prt time contract.
Of course mixed fleet cabin crew combine short haul flying with operating the SIN/SYD/SIN 9 day trip, so whilst to/from Oz plus shorthaul sounds outlandish the company roster something along those lines... but you’ve obviously got to stick to the rules.