Please comment on the advice I gave to my friend about a problem he ran into this weekend and let me know if it was correct or if there was another alternative.

My friend and his brother traded home clothes dryers (don’t ask why) but now there was a 220V plug configuration problem. NOTE: this is in the USA.

My friend now has a 3-wire outlet and a dryer with a 4-wire male plug.
The brother now has a 4-wire outlet and a dryer with a 3 wire male plug.

He wanted to just put a 4-wire cord on the 3-wire dryer and a 3-wire cord on the 4-wire dryer (tying the ground and neutral together).

My advice was that my friend needed to install at his house a 4-wire outlet and run 4-wire Romex to it.
My advice to fix the problem at his brother’s house was to replace the existing 4-wire outlet with a 3-wire outlet connecting the ground and leaving the neutral wire disconnected at the outlet.

Right/Wrong/Alternatives?????