Home v. Origin - How to Resolve?

I have a Prusa I3 style printer (Aurora A3).
So it's home position is off the print bed - to the left and forward about 40mm x&y.
It's print area is 190x190 square
If I print something at 0,0 it is actually offset left and forward by 40mm.
My original solution to this was:

G28 X0 Y0 ;move X/Y to min endstops
G1 X40 Y40 ;Move to print origin
G92 X0 Y0  ;Set this coordinate to 0,0

But this appear to just shift Home position so now nothing will print within 40mm of the front or left of the print bed.

So, just now I tried:

G28 X0 Y0 ;move X/Y to min endstops
M206 X40 Y40 ;Add these offset to move commands

But somehow that allowed it to print outside the print bed!

Doing this was bad, very bad:

G28 X0 Y0 ;move X/Y to min endstops
M206 X-40 Y-40 ;Add these offset to move commands

Hope someone can help, I've run out of idea.

So how can I set my printer up so that HOME is outside the print bed, but the Print Origin is on it?

Thank you for any help/assistance/suggestions.