Go ahead and repair your sidewalls. Just don't drive on my highways near me, OK? I value my life more than that. Cord damage & failure leading to ply separation and wall shredding happen far too often in sidewall punctures to suit me. I'd rather not have that happen to me while I'm traveling 75mph down the highway, thanks.
I have Wally World tires (made by B.F. Goodrich, same mfgr. as the truck was delivered with from Ford) which are only about $45 ea. That includes a 40k mile tire, installation, valve stem, mounting, balancing, and a road hazard warranty.
Even if they cost $200 each, my life (and the life of each of my passengers) is worth more than that. Why risk it with a patch? I might patch a spare, but I'd replace it with a decent tire at my earliest convenience. YMMV.
- - - - - - - - - - - - - - - - - - Heart Attacks: God's revenge for eating his little animal friends --