I'd say you're plan for modular sounds OK. If it were me I'd not be going down to part time hours at work during the ATPL ground school - but each to their own. It will undoubtedly make the studying easier and if you can cope with the drop in income thats OK I guess.
Again from a purely personal point of view, the 8 months without flying would annoy me awaiting to go to SA or similar for the hours building. If you could hour build whilst over here for a cheap rate then that might be worth considering. Still - thats a way off yet. Step 1 is to get your PPL. Good luck.