He can't
make them. He's DEAD.
You also put out a disturbing notion that people shouldn't ask for something out of fear of offending. "Well, I'd like this to be how my body is displayed at my wake, but the family might be offended, so I won't put it in the will." Hiding what you want lets no one know your desires, and just makes everyone miserable.
Here's how it should go down:
"I'd like my body displayed this way."
"No, we're not comfortable with that." Which does not mean "But we'll do it anyway." That passive, begrudging submission is the worst way to go through life. Again, just makes everyone miserable. Notice there's no response from dead guy--because he's dead. He can't argue his point.
One should still make the request, because the alternative can be:
"I'd like my body displayed this way."
"Sure, we'll do that."
Damn, I'd hate to be someone going through life telling no one what I wanted, and then when they tell me what they want, having a "fine, I'll do it, but I'm not gonna like it and you're selfish" attitude. Seems like a good way to be unhappy and make others unhappy through your joyless demeanor. People need to be a little selfish, at least enough to request the things they want. They also need to be gracious to accept when those requests are shot down. Except this guy doesn't--because he's dead. He wasn't going to be there to beg or guilt or anything.
So if they didn't want to do it, they didn't have to. On some level, they desired to go along with this. If it offended them so badly, they could've stuck him in a casket for the wake and been done with it.
That's all for arguing through the logic of what you're saying. On-topic, this guy was 22. He probably didn't even have a will. And the article itself says:
upon Mr. Colón's untimely demise, family members delivered the bike to the funeral home specifically for this unusual wake.