What alternative is there to helping someone use a urinal every time he pees?

If he still has the dexterity to "manage" things "down there" a hunter's portable urine bottle might work. You can find them online and they don't cost much.
https://www.cabelas.com/product/Little-John-Portable-Urinal/746951.uts?productVariantId=1630710&WT.tsrc=PPC&WT.mc_id=GoogleProductAds&WT.z_mc_id1=50013906&rid=20&ds_rl=1252079&ds_rl=1252079&gclid=EAIaIQobChMIndHD1rO86AIVwp-zCh2liQiQEAQYASABEgL9XPD_BwE&gclsrc=aw.ds

There are several options.
Helping them get to the bathroom or commode. This would be more time consuming than helping them use a urinal.
Pull up or tab type incontinence product
Condom catheter

He should wear an incontinence product - a guard or a pullup.