System standards do have a condenser, that’s why they have a necked down portion on the end of the tenon. That smaller diameter section is the condenser.
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Pre WWII KW’s are very collectible, and there are many who collect them. Most KW collectors won’t touch a clipped pipe. Having said that, not all KW’s have value, later KW’s don’t sell for much, common shapes don’t sell for much.
My advice to you would be this, clipping the stinger off a KW won’t really change anything, it’s still gonna be an aluminum screw fitment with a tight draw that you can’t get a pipe cleaner through.
Once you figure out that clipping the stinger didn’t help and it smokes even worse without it and still won’t pass a cleaner you will have a pipe that might have been worth $20-40 is now worth $0 to anyone.
If you’ve made the decision that a stinger is just against everything you as pipe smoker stand for, then put it on eBay, make few bucks and buy some tobacco.
Ultimately it is your pipe, you can do what you wish with it.