No it can't be done -- they are binary files that you cannot access in Python. If you look there is text embedded in the tbx file, but that's just the metadata - tool documentation (XML code).
The only way to do this is to go through and update the script paths one by one for your 94 tools. If you go to relative paths [or embed the scripts in the tbx, or do Bill's suggestion to make a pyt], from here on out you will never have to do it again. Personally I like leaving the scripts outside the toolbox where I can easily edit them.