Yes, you can (unfortunately) apply a 5kA SCCR to a UL 508A listed panel without any effort. I call it UL’s “courtesy” SCCR listing. It’s all but useless, but technically, it’s possible.
The problem that Tom is pointing out to you is that this is a TOTAL pain in the rear for the poor electrician who is responsible for connecting it up to a system that has MORE than 5kA of available fault current. In industrial environments (and many commercial ones), that is virtually EVERY instance. There is no way for an installer to lower the available fault current without a major modification to the source of supply. So you are “kicking the can down the road” to someone with no reasonable ability to solve the problem. When that happens, they (we) curse your name, your heritage, your children or future children and the white horse you rode in on…
PLEASE do not do this. Take a few extra minutes to investigate the SIMPLE steps it might take to attain a higher SCCR for your panel. In most cases, all it takes is to look at the series listings of the power devices and MAYBE having to select brands that are coordinated with each other.