[splat]

Lensing will make light travel through only a very slightly longer path. At most the difference will only be a few light-weeks. (This is seen in objects which have multiple images. Occasionally you will see one of the images flare up for some reason, and a few days later the other image will flare up.) It won't be anywhere near long enough for cosmological effects like redshift to be important. The main effect of gravitational lensing is just to increase the apparent luminosity of the lensed object.

[nitrogen]

Thanks for the clarification. I was imagining a situation that would require tens of degrees of deflection, with two or three lenses zig-zagging light across a cosmologically significant distance.