Sorry Lando, but you've already made the first mistake. That was powder coating things before you were done with the planning and fabrication. And planning to put powder coating something in the future first and foremost above the correct installation of an important part of your steering and suspension, does not make good common sense.
Beauty before functionality doesn't always win the race.
I think you're putting the unimportant before the important. You did it once with the axle, so don't keep making the same mistake with the frame while you still have time to do some welding before powder coating.
This is why the pros that can charge $200k for a build will build everything first, then tear it down to paint or powder coat after all the actual work has been done.
It's not something we can all do of course, and it does make logistical sense to coat stuff when you can, and when you actually believe you are done with that part.
But as many members here can attest, over the years doing things in that order has come back to bite many of them. Sometimes more than once!
So my advice for now is, because you already coated your axle and did not intend to use a riser in the beginning. And because you may lower your suspension height at some point in the future, as you stated, forget the riser for the moment and just add the trackbar bracket in question and weld the sucker in place. You will probably never have to remove it.
Make sure to add a dropped pitman arm at the same time, simply because you must. They are to be used in tandem with each other unless you have a '76 or '77 Bronco?
Did you say what year yours was? I'm guessing '75 or earlier based on how the bracket looks in your first picture.
The bottom line is that the bracket has to be welded to give you the full effect. Without welding, you will experience some slight wandering on the road as it flexes. I know this for a fact because that's how my '71 reacted while I drove it around for about a month before welding it on. The difference was instantaneous and noticeable.
Lost all of the wandering tendency. Slight as it was...
And as I've stated many times before, you can still fully benefit from a trackbar drop and pitman arm even with just 2.5" of lift. So go ahead and powder coat it all after it's done and keep it even if you lower your suspension.
Just don't go below 2.5" or you probably will want to remove it. But only time will tell at that point.
A riser is definitely stronger, as has been said. But it's more work, will damage your already existing powder coating, and will potentially need other tweaks, adjustments and fabrications to go along with it. The drop bracket is less detrimental to your current build schedule and will work just fine on the street.
Speaking of which though, what steering setup, what size tires, and what axles are you going with?
Those questions are pertinent even at this stage because some of those things will contribute to extra stress on frames and mounting brackets. So it's all important.
It's one big package even if you're working on different ends of the truck. It all has to work together in order to give you the best experience.
Paul