Hi @bnickas041774,
As @Patchy & @Jonathan3891 said, you can use the command "AliasEdit" either by typing the command or going to the express tab > Tools Panel > Alias edit - and then edit the aliases one by one..
- To use a custom *.pgp file that you alredy have, in the same window of the "aliasedit" command got to File > Import and select your .pgp file (this is safer than overwriting the current acad.pgp manually which could cause you to lose the aliases of the new commands added in newer relaeses of autocad in case the pgp file belonged to an earlier release..)
- If you want to edit the Acd.pgp manually (Not Recommended): go to Manage tab > Customization Panel > Edit Aliases. But note that there are several points to consider, you can read about them in these articles: Artcle 1; Article 2.
@rkmcswain Approach was a little different, he used LISP to define new commands with shorter names that call the original ones; which also works perfectly..