BÉPO, please BÉPO

Why the IOs version is so below the Android version ???
I NEED the BÉPO layout. It is my keyboard since so many years, Azerty has become a no-brainier for me.
I very happily use Swifkey on android since 2012 and now that I have the newest Ipad pro, I have to switch to en expansive low quality app in order to have my good ergonomic, scientifically engineered layout.
How difficult could it be to add it on the IOs version ?
Thank you very much for considering it.