A novel solution to poor longevity
This is only theoretical - I've not tried it - but once mixed, ferric EDTA (brown bleach) and thiosulphate (fix) will degrade one-another in the presence of oxygen (air). Why not try bleaching in bleach and then fixing in fix? This is, after all, the procedure for film in C41. I can't suggest the timing or temperature but give 50% longer than when the appearance changes. In fact you might consider using C41 bleach and fix. C41 bleach is expensive but can be replenished and used for a long time. Paradoxically, it needs to be aerated (kept in the oxidised state) to work properly.
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