The 20x10.5 ET+35 is on the aggressive side but may work, depending on the tire size you run. The front lip of the 20x10.5 ET+35 will sit just under 1/2" further outwards when compared to where the front lip of your 20x11 ET+50 wheels sit now.
How close do the rear wheel sit to the fender now?
Ya it looks like it will stick 10mm out further. The previous rim sat almost flush it was perfect although im unable to find any rims i like with that spec. I went with a 20x10.5 +45