This has been discussed a few times already. Here is one place you can give a look:
Tbh, a 2-digit PAO is not big, so the time you’ll save won’t really make a difference, but Tim’s points are solid, so I agree with his assessment that it’s better to have actions and objects that are independently associated to the number.
Also, if you have any trouble filling your list following the Major System, there are a bunch of resources you can use, which I may share if you’re interested.