I looked through various questions and answers on what to do to help with elders/handicapped missing the toilet and so far the best I could come up with was towels around the toilet. I hit upon the solution of putting a trough of aluminum foil around the toilet and filling it with cat litter - the clumping kind. This works like a charm and is easy to clean because I can just scoop it up. The cat litter is also scented and cuts down dramatically on the urine smell.
Of course he might gripe that is only for women to do, like it would be an insult... [sigh]. I overheard in my office two fellows who were in their early 40's, former college basketball players and weekend players saying that sitting down works best for them, and they saw nothing wrong with doing that.
If sitting down doesn't work, and he's able to help with the cleaning, hand him a bottle of cleaner and some paper towels and have him clean up his own mess. My 90+ year old Mom did that with my Dad when he refused to wear Depends and was messing up the carpets. Before you knew it, Depends was on their grocery order.