Urinating in the toilet is less a problem with my husband than defacating. This morning he went in his depends. I encourage him to try several times. Even at key times. He sits there, wipes himself. There has been nothing. We have to change his depends about 3 times a day. He started this by having an issue with the toilet paper. Seems like he just hates the toilet for this purpose.
As for peeing, rather than change Depends several times a day, I put a Depends Booster Pad in his diaper. That way I can just pull out the pad and replace it without having to replace the whole diaper. Much easier on both of us. A little trick: if you don't pull the paper (that covers the sticky part) off the bottom 5 inches of the pad, it will still stay in place but when you pull it out, it will come easily without even having to pull his pants down very far.
I vote whole heartedly for the wipes too. I bought a 'wipe warmer'. It's a container for baby wipes that keeps them always a little warm. My husband was very resistant when I just used tp or cold wipes but doesn't mind warmed wipes.