I'm not buying a $300 piece of pipe with a name brand just to be cool, when I can make it just as well as anyone.
Ehh, where did that come from?
If you think I'm recommending you to buy expensive stuff just to be cool, your really barking up the wrong tree...

Where did I write anything about a $300 drag link???
I just gave you an advice on what material to use...
What I said was:
1. don't use TRE's (or 2wd pitman) for the drag link since they don't have enough angle capability
2. don't use the tie-rod tube you found since it will be too weak, when used as a bent drag link, cause bends makes it much weaker.
But as you are an "experienced fabricator, and pretty good at understanding how things work."
That shouldn't come as a surprise
As for DLE's you can use stock Chevy DLE's.
If you want a shorter arm so you can place the first bend in the drag link closer to the steeringbox (to minimize crossmember interference),
you can get a special one that lokes like TRE, but have the angle capability of a DLE.
Offroad design has them, among others.
But you need another pitman arm.
A quick search on the subject should give you some alternatives.
Keep in mind that the length should match your steering arm, and don't use one with excessive drop if you don't have much lift, otherwise it can interfere with your leaf springs.
Most pitman arms requires you to grind off indexing tabs and/or reaming out the tapered hole to accept Chevy DLE's
Unless you buy one already modified by an offroad-shop.
I guess you could use an existing smaller taper though if you find the corresponding DLE for it.
There's no way of telling what taper your steering arm has from a picture.
Try inserting a Chevy DLE and see how it fits.