How to track through an interruption in the cue flow, e.g. for a freeze look

Maybe you could use a group with all the channels in your base cue and save intensities in an intensity palette. This way you only need to update your intensity palette to update all other cues.

No, there currently isn't. Once tracking is interrupted by a block or a move instruction (in your case by the freeze cue), it can't resume automatically.

I believe that on someones notebook somewhere, there is a feature request for this very thing. A couple of years ago I brought this up in an advisory team meeting, to implement something similar to the Skip Cue function on Compulite consoles, where you can 'flag' a cue as a Skip Cue, and when updating to track it would essentially tunnel the update under the Skip flag and continue to track as normal until meeting a form of block/move.