It may be a bit of a tight fit and there are heaps of links so if you are going to use this approach you need to be very careful not to forget any of the links and make sure there aren't any shorts.
Here's his design (click on it to download a PICT version)....
And the copper side...
There are only the two additional components, apart from links, compared with the original board. These are...
Also note the extra bridged tracks under the board and that several of the original components are in different positions. All that's left to decide is which output to HSKi (Pin 2 of the mac socket) to use. If your crystal is 2MHz, use A1. If it's a 4MHz one, use A2.
You may notice that by reducing the length of one of Jean-Yvan's links (the one to the immediate left of C4) you can eliminate the other link (to the right of C4) but either way it will work.