how to run conduit past/over wide stone foundation
Your bigger problem is running out of allowable bends (or pullable bends between access points,since pulling near the max allowable is a bugbear and often beyond the ability or available tools of DIYers.  You end up humiliatingly having to call an electrican simply for the pull, and once called they want the whole job.  

I would consider a conduit body right at the upper vertical bend.  

Conduit bodies are 90 degrees, so I would add a slight ~20 degree bend onto the short conduit coming out of the access panel, to tuck it upward slightly, so it is perpendicular to the angle of the outside wall.  Then, when you make your 90 degree with your conduit body, you come down at the correct angle.  That will also mean you face less than 180 degrees of bend through the underground section, still in the DIY-pullable range.