I also like the idea of giving Motte a chance higher in the lineup.
Your lines above are fine if Podkolzin needs some time to adjust into the NHL. It may take some time, but I think he is like a race horse, chomping at the bit to get out of his starting stall...
However, if Coach Green decides to go with three scoring lines, I think Motte should be in the mix:
Motte Pete Beoser (Motte provides speed and defense to top line.) ( But can Pete improve in the faceoff circle?)
Dickinson Miller Garland (This line has gusto!)
Pearson Bo Hoglander (This line works fine...)
Highmore Sutter Podkolzin/ McEwen
But if Podkolzin is ready to go, I would prefer a first line of:
Podkolzin Pete Beoser (Podkolzin can help with his physicality, forecheck and backcheck, and maybe help Pete with faceoffs...)
I am still hoping that Podkolzin gets an opportunity to try the center ice position, I think he could be an elite third line center...