Old version (2.6.5) Time signature before bar line?

[Ed Ardzinski]

I have a repeated section that has a time change in the final bar.  I asked a composer friend about the proper notation, he was stumped.  I'm figuring that the change should be before the repeat bar line (maybe in paarentheses?).  If anyone can give some hints or links to discussions on how to do this I'd appreciate it.
 
Thanks!