Why bother with a solid front axle at all?
From your description of the intended use, I am kind of at a loss why you would bother? Short of a coil setup a straight axle won't ride as well.
Unless your hardcore wheeling with it you probably won't break the ifs.
Lifting it a won't help with towing.
You have bad ass blazer to beat on, why you would actually wheel this? Trails and fire roads the ifs will be fine.
Spend the money getting a rear locker and posi lock for the front diff, a supercharger for the fat block. Tires, good shocks. Etc, etc. Tons of things you can do to make this thing better without instantly junking the (probably in good working order ifs)
I honestly feel like enough due isn't made for the ifs systems on these trucks. They are actually pretty good. But because they don't articulate like a solid the hardcore guys like yourself want to junk them.
I have the pickup carbon copy of this ride and have taken it all around the mts, in Colorado and Wyoming, and never felt the need for a solid axle for (basic) trail running.