I am enjoying literate programming with org-mode. I'd like to solicit
advice on good ways to go about making one of my favorite emacs
keycombinations, M-/ (dabbrev-expand), work with literate programming in
org-mode.

The setup: I have a code block in which a variable name is used. Later,
outside the code block, I'd like to refer to that variable name, and since
it's code, I'd like it to be inside =equal sign= markup. The starting =
prevents M-/ from matching the first few characters of the variable name.
Example:

#+BEGIN_SRC python
my_cool_variable = 42
#+END_SRC

I'd like to now type "=my" and have M-/ be smart enough to consider
"my_cool_variable" and complete it to "=my_cool_variable=".

I can try hacking up something simple-minded to do this but would like some
guidance to find a way that will break the least number of things for the
least number of people. Many thanks,
Ahmed