As far as I know, the ATO can reward you a small reduction for having a PPL. I'm not aware that having more hours above a PPL can be counted towards further reductions.
Self sponsored integrated is (IMO, but I'm not alone) an expensive way to be in the exact same position as doing things the modular way.
Part sponsored ATPL or MPL will be the better option in terms of jobs etc, but having already spent so much (probably close to £20k?) you have to ask if it would not be better to complete your training in the modular way, which could cost £20k or maybe less if you are smart about it, compared to getting a (from memory) 25 hour reduction on an integrated course and it still costing you probably over £70k.