Return find results in whiptail option menu

Question

I have these directories:

/home/user/ABC
/home/user/D3A
/home/user/BC1

The idea is that I want to search for any directory name that has only 3 alphanumeric characters and return them in a whiptail option menu, where I can select one of these results and pass the result in a variable.

The variable should contain the full path. e.g. /home/user/BC1.

This returns what I need, but I also need whiptail to show the results in a menu:

find /home/user -type d -regex ".*/[A-Z0-9][A-Z0-9][A-Z0-9]"

Any help would be appreciated!