How to create hotkey to check if variable name is valid - macros

Question

As Robert Martin says,
"You should name a variable using the same care with which you name a
first-born child."
SAS's 32 character limit can make this difficult sometimes. It would be nice to know if a given name is valid. Fortunately, SAS provides a function for this: NVALID.
With this, we can construct a script that tells us whether or not our name is valid (NVALID doesn't seem to work directly in a %PUT statement).
data _null_;
name_to_check = 'isThisAValidNameOrIsItTooLong';
isValid = nvalid(name_to_check, 'v7');
if isValid then put "WARNI%str(NG-) Valid name: " name_to_check;
else put "ERR%str(OR-) Invalid name: " name_to_check;
run;
This could be turned into a macro.
%macro CheckValidity(name_to_check);
data _null_;
isValid = nvalid("&name_to_check", 'v7');
if isValid then put "WARNI%str(NG-) Valid name: &name_to_check";
else put "ERR%str(OR-) Invalid name: &name_to_check";
run;
%mend;
%CheckValidity(IsThisAValidName?);
Furthermore, we could bind this macro to a key in the KEYS menu.
submit "%CheckValidity();"
Of course this particular binding is pretty much worthless. That is, unless, there is a way for us to feed the function an input.
Two possibilities come to mind toward this end:
Bind selected text to a macro variable. Then the selected text could be fed into the macro via submit "%CheckValidity(&selected_text);"
Somehow use the KEYS paste keyword.
I've not had any luck with either approach.
In Case 1, it's not clear how to make the Enhanced Editor self-aware. That is, I don't know how I would go about binding selected text to a macro variable.
In Case 2, it's not clear how the paste keyword works, as there isn't really any documentation for it. Whenever I use it, I get
ERROR: You must paste into an input field.
My questions are these:
Is there a way to bind selected text to a macro variable?
Can the paste command be used to paste selected text into the input of
macro?
Is there another way this same task could be achieved?
Sure, this same task can be easily performed with something like AutoHotKey. But can it be done with just SAS?