We just got to be careful here… this is a very sharp instrument. If for example wordpress is in “Top N” mode where it show only the best content we can end up setting a canonical to a page that does not have all the overlapping content, this is terrible signal to search engines and can be penalised heavily.
In fact, the whole “collapsing” of OP may make this a bad idea, the OP really should be a complete duplicate of the canonical page, so we may need a different technique there that collapses on client side.
I would not rush anything here.