Technically not feasible !
The distance of Nikon camera from mount to film is longer than the distance of Canon camera from mount to film.
Therfore, you may use an adapter to fit a Nikon lens to a Canon body. But you cannot use an adapter to fit a Canon lens to a Nikon body ( Even if you can fit, the lens will not be able to focus to infinity ).
I was about to mention 500D acromatic lens to you... Seems like you already tried many many things.
I have been dealing with micro-scopic things ( electronics stuff ) and have seen many setups that uses a microscope ( x20 amplification ) with an adapter to fit a DSLR at the eyepiece location.
However, if you are going to shoot outdoor... then good luck...