Like Coloradomrg said, a lisp can be used but it not necessary.
You would use one of these macros depending on how you block was created. If your block was created with the "Scale uniformly" option checked then use this one:
Code:
^C^C-insert;L:/AutoCAD/Template/EDL.dwg;\;;
Otherwise use this one:
Code:
^C^C-insert;L:/AutoCAD/Template/EDL.dwg;\;;;
Another question, do you want your block inserted at a scale other than 1? If so, use the following codes:
Code:
^C^C-insert;L:/AutoCAD/Template/EDL.dwg;\<insert scale here>;;
Code:
^C^C-insert;L:/AutoCAD/Template/EDL.dwg;\<insert x-scale here>;<insert y-scale here>;;