Grimey did that here
http://geekhack.org/showthread.php?32362-My-AT101W-Collection
and seemed to get a result that he was pleased with.
I picked up an NTC 6153EN earlier, XT/AT switchable 102-key, "FOR 8088 & 80286" according to the label. I didn't realise until later that it's [strike]Type II Simplified[/strike]
Type IV Simplified, surprising to see simplifieds in something that old. I realised something was wrong after I noticed that it felt very similar to my Acers, and then spotted the dreadful four tabs around the switch
The switches have a fantastic resonant sound and a warm, melodic ping, almost as good as complicated blues, but it has that nasty XM feel. Not as bad as brand new XMs, but I can't tell how worn it is all the keycaps still have their surface texture pattern, so it's either lightly used or really good plastic.
I'm really curious what it is that has been done to make XMs nice, as opinions on the green XMs are universally positive.
I'm glad to read that Matias ALPS will be coming out in "loud" versions (I presume that means undamped, rather than clicky), as Fukka is a good switch and something needs to replace them, although it sounds like XM could do the trick if you want actual clicky switches as I do at home. Except why green? Green means linear
Definitely buying the new Matias though, hopefully the ISO version will hop over to Keyboardco in short order