We want to verify the TSS Backup File is viable. Is there is a way to verify the TSS Backup file is viable other than bringing TSS up with the TSS Backup Security File and running a LIST ACIDS?  

Release:
Component: TSSMVS

Take a look at the below link and information about TSSCFBK.
TSSCFBK: Produces customized reports with information extracted from the backup CA Top Secret security file.
https://docops.ca.com/ca-top-secret-for-z-os/16-0/en/reporting/tsscfile-and-tsscfbk-utilities

f the report(s) run and the information looks good then you can conclude you have a good backup file :-)