I can go with the idea of a PDAF adaptor, though prefer built in PD.. As regard focus peaking, not to sure of it, having looked at it in store I am not convinced of it’s accuracy, preferring the selection and accuracy of my eye.
As regards your request for a simple adaptor (surely we have this with MMF1, 2 or 3), which function very well with older lenses but not the newer SWF’s (where the need for PD lies). Back to the focus peaking question I use a number of legacy Zuiko lenses with an E-P2 with little or no problem with focusing (difficulty with long glass due to camera not resting against my face).
The rest I’ll agree with, an E-7 & E-M7 essentially the same camera covering both systems, catering to both groups of users, though I cannot see that happening, the same camera in two bodies!!!!! Bring both or either on I say.
Still using an E-1, E-620 and E-P2; supported with the wonderful C5060WZ.