Speaking of having more 'throwbacks', we currently have generic White and Cardinal helmets and pants, yes. No stripes. Why not simply reproduce a semi-replica jersey (even slightly modified), jersey only, from the different eras. Optional would be a replica helmet decal or stickers, but they could even skip that.
Just having a replica, or near replica jersey, with the current color scheme, would be fantastic and very doable. It would be very cheap, if cost is an issue, and it probably is now.
Give the jerseys to the players (like they did with the whole Trice uniforms last year). Or, have a year-end sale to the fans, for the jerseys. You'd get much of your money back for sure then. If you give them to players, great, they deserve it, and you will get that money back from them, in time, with their alumni donations anyway.
This would be much cheaper than the 100 year Trice anniversary uniform of last year. They had to purchase a whole set of pants for every team member dressed out. Ordering a replica jersey, with no pants, would be quite inexpensive, relatively.
It would also create super fan interest and be a lot of fun. Even just doing it every other year, or every third year, would be great. Mix it up, have some fun. Isn't that what our new Big 12 Commish is saying? Find more ways to be relevant, create fan interest.