I think all of these suggestions should go in a thread entitled "Tips and procedures not found in the Haynes manual." Or something like that.
The following was suggested by a long time porsche mechanic. I tried it and it worked great.
Make a sharp diagonal cut thru the bushing. Stick the sharp end in the hole and just twist it in. If it resists at all, a light tap will inch it in. took about one minute to install.
Now the shifter boot that covers that mess is a bit tougher. Getting the boot seated all the way around that narrow ass lip is a pain.
My friend Craig (Cametal) showed me a good trick he discovered. Hook the top side over the lip. Then insert your finger inside from the other end of the boot (towards the tranny) and locate the rim of the boot from inside and push it over the retaining lip a bit at a time. Combine a handful of profanity and a few minutes of your time and it's done.
The other end of the boot slips in place very easily.
In fact, I did this one just a few hours ago after installing my new clutch.