@dc42 thank you for fast response. I am looking for 13th and 14th (or even 15th and 16th) stepper driver so not existing expandability options within duet2+duex5. So not exactly what i asked but I'll settle for this kind answer.
Duet 3 mini with expansion would give 7 stepper drivers each, so 14 needed, but i do have to read up if this would also have 8 channels of PWMs for fans, five heaters + at least 1 PWM for bltouch/probe and stuff that is needed to drive one proper IQEX...
I'll have to read up but ain't thrilled on going anything mini. It's just the ordinary "go duet3" way then OR doing an addon PCB for multiplexing.. Ourighty then.