(CMOS 17) Combining a title and subtitle that both have colons in a cited work

The main title of the work is Zom 100: Bucket List of the Dead and the subtitle is “Zom 100 Special Program: 100 Things You Need to Prepare to Run Away from Zombies”.

I've looked through CMOS 17 and can't find anything that directly addresses this conundrum. Only 14.90 “Two subtitles in a cited work” comes close, but even that’s a stretch.

My best option is to do something like this:

Zom 100: Bucket List of the Dead; Zom 100 Special Program: 100 Things You Need to Prepare to Run Away from Zombies

What do you guys think?