Jeff, tubes have been used on steel safety rims for several decades. That's the exact same rim used on today's cars (alloy wheels have the same rim profiles) You just have to know what you are doing. I've installed a few hundred tires with tubes over my life as amechanic - only damaged a very few tubes.
The bigger problem is tubeless tires have ridges on the inside that cause heating when the flex against a tube - and radials are worse than bias ply. There ARE special tubes made for use in radial tires that work in tubeless tires but are NOT recommended for high speeds.
Also a bruised sidewall is likely to also damage the tube by abrasion
Worse yet, the fabric on a radial sidewall is RADIAL - which makes it even more fragile than a bias ply sidewall