I think a long lapel is the Key. I understand your selling point, but a 6x1 that you can button 6x2 could do good. Luka Rubinacci style and not like the rake where the bottom buttons are not parallell. The one you pictured here looks very good, but appears to have a lower buttoning point than most rtw.
Currently in store only, but working on figuring out a sensible way to do remote MTOs too.
The biggest issue is the price, as our RTW prices are very good. Buying cut lengths from the usual suspects it would not be possible to sell at the same prices as the RTW where we buy fabrics by the roll.
I think you could select some staple fabrics and buy buy the roll. Vbc 4-ply and probably some flannels. It could atleast get ppl into the mtm train.