I'm not an expert, but I think you are ok at 1.2 bar on a j-spec without requiring ecu mods, you will of course need the vfcd if you hit fuel cut. 1.2 is about the very max safe limit you could run on those ceramics anyway as you probably know.
I understand that you might be best off with a new (better) fuel pump e.g. a 255lph Walbro and a new fuel filter.
If you want to remap, the greddy emanage (and emanage ultimate) look very very good. I plan to fit an emanage ultimate and profec e-01 in the future. Also fitting a FPR will allow you to run higher fuel pressure and thus avoid "running lean", ideally this would be remapped using the emanage of course, this would allow safe and optimised operation whilst still retaining those 440 injectors, for a decent BPU+ car...
I'm sure some experts will be along to fill in the missing details, but I think thats about the size of it, HTH