If you haven't already done so, make sure to ask
FelineVet if he has any available.
If not, I'd keep an eye on those TSA confiscation auctions on eBay.
If you just want the Pioneer for its keyring, you should also consider the Wenger SI which has a bail. You could just use the bail or easily swap it out for a keyring.
The SI is virtually identical in quality and design to the Pioneer. There are a few
extremely minor differences, but the main difference is that the Wenger has a better awl.
There is an article on SOSAK with details if you are really interested, but they are basically equivalent knives.