The Chilco is an awesome bike. I’ve seen the eBay ad and your ponderings on here. I have a first gen endorphin which is ace (and has been for years!) around the peak and the odd up lift day. The frame is heavier than your Chilco frame.. I’d say its not too much bike if you’re riding proper tech trails and odd uplifts etc. Despite advice to the contrary no doubt on mtbr, I’d be tempted to build it a little lighter than most builds on there.
Scratching your itch will cost a lot more than the actual benefits of riding a warden/any other latest and greatest 650b. You have an awesome frame there! Unless of course you can afford a wholesale change, then I say be quick and order up a warden!