The only thing that I know of that comes close to checking all the boxes of your feature requirements would be Drambo:
Very powerful. Still, you will likely never see anything like Overbridge on anything but the current platforms. Elektron provides no way to access the individual audio channels in any way other than through Overbridge.
If you want some Digitone-specific patch generation iOS software then, take a look at our own @mekohler’s Harmonix: