This is quite a significant update, thank you!
It makes Program Change almost usable 
Almost because Synth no longer has critical issues when using PC (as reported here and here) but the defect with samples not reloading for WAVS and GRAIN engine presets is still there. I described the details and recorded the video here.
It’s a pity that we lost the ability to preview presets in PC mapping but if that’s the price for a stable device then I’m okay with that. Is it a temporary solution or it’s going to stay like that for good?