Tried it last night by moving the image around the walls at different angles, all I was able to to was rotate the image the further I moved it off centre.

What might work and I wasnt able to test is to tilt the whole projector (not very practicle
if you have a verticle pro setup like me) then use the mirror to project it back to the wall.

I was really hopeing this would work

You know at first I thought you could keystone with a mirror, but a simple experiment with a mirror showed me that the mirror only translates the images position, it only changes the geometry of the image if the mirror is not flat.

I would imagine you can still keystone with the fresnel and use the mirror to position the image?