This is what I was thinking of:
Show Image
(http://deskthority.net/resources/image/4208)
The only hard part is modifying the plate to accept the space bar barrel as it is full width and has the barrels for the stabilizer wire built in. The PCB already has the pads and xwhatsit utility works just fine with it. I didn't do the space bar mod on my AT, but I have tweaked the numpad area to a straight 4x5 matrix with numpad and dedicated arrow keys.
In case anyone is curious. (http://www.keyboard-layout-editor.com/##@@=Insert&=Delete&_x:0.5%3B&=Esc&=F1%0A1&=F2%0A2&=F3%0A3&=F4%0A4&=F5%0A5&=F6%0A6&=F7%0A7&=F8%0A8&=F9%0A9&=F10%0A0&=F11%0A-&=F12%0A%2F=&_w:2%3B&=Backspace&_x:0.5%3B&=7%0AHome&=8%0A%E2%86%91&=9%0APgUp&=Num%0A%0A%0A%0A%0A%0ALock%3B&@=Home&=End&_x:0.5&w:1.5%3B&=Tab&=Q&=W&=E&=R&=T&=Y&=U&=I&=O&=P&=%7B%0A%5B&=%7D%0A%5D&_w:1.5%3B&=%7C%0A%5C&_x:0.5%3B&=4%0A%E2%86%90&=5&=6%0A%E2%86%92&=%2F%2F%3B&@=PgUp&=PgDn&_x:0.5&w:1.75%3B&=Ctrl&=A&=S&=D&=F&=G&=H&=J&=K&=L&=%2F:%0A%2F%3B&=%22%0A'&_w:2.25%3B&=Enter&_x:0.5%3B&=1%0AEnd&=2%0A%E2%86%93&=3%0APgDn&=*%3B&@=Vol%20+&=Vol%20-&_x:0.5&w:2.25%3B&=Shift&=Z&=X&=C&=V&=B&=N&=M&=%3C%0A,&=%3E%0A.&=%3F%0A%2F%2F&_w:2.75%3B&=Shift&_x:0.5%3B&=0%0AIns&=%E2%86%91&=.%0ADel&=-%3B&@=PrtSc&=Fn&_x:0.5&w:1.5%3B&=Caps%20Lock%0AAlt&_x:1&w:10%3B&=&_x:1&w:1.5%3B&=Win&_x:0.5%3B&=%E2%86%90&=%E2%86%93&=%E2%86%92&=+)
This is what I was thinking of:
Show Image
(http://deskthority.net/resources/image/4208)
Exactly.