There may be differences between incontinence arising from a spinal injury (neurogenic) and that arising from sphincter damage or other issues arising from bladder cancer. If he’s had surgery they may not want him self catheterising atm.
One thing I would say though is for your friend to have a word with the nurse specialist helping him with his urology products – there are many different types and makes.
I went to a bladder and bowel education day the other week. One sheath was really impressive the guy demonstrating it put it on his thumb and his assistant pulled him (in his wheelchair) around with it.(not saying you’d do this when it correctly positioned – but it does show how good the adhesive is!)
I can find the make of that as he said it could also be used without a bag if the loss was small as it had a little capacity in the sheath itself.