I've never had need to do this but if you do undertake this make sure the new path doesn't bind or restrict the cable movement OR that you inadvertently shorten the cable thereby engaging the parking brake even slightly.
IF you find the cable has the e-brake shoes contacting the rotor it would be possible to adjust the shoes so this doesn't happen and you'd still have proper engagement when needed or wanted. You'd have to raise the van and remove the wheels to do this. Its not all that technically difficult but does require a bit of "heavy lifting". Of course if you're already wrestling batteries up to the frame rail this wouldn't be that difficult.