Would a PST blade work ?
Not really. It is to long and will foul against the wire stripper tabs. The Sideclip and the Crunch blade is the same length. I will need to do some modification to it to accommodate the locking mechanism.
Have you contact Leatherman to see if they can install a new one for you?
Both tools I have are near new. My Sideclip is the first full size Leatherman I bought and it has a lot of sentimental value. I am not going to pull it apart. And I think asking Leatherman to install a Sideclip blade in a Crunch will go against their policy of modification of tools, and they may not have one either.
I will continue looking. A fellow on our local Buy and Sell site has a "marked" (judging from the pics - rusted) one for trade and refused an offer of $50 from someone else. I don't think the tool is worth more than $20, and if he refused the $50 he certainly will not take my $20.
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Cheers,
Pete