I have a roll (300'x24") of highly calendared craft paper that I use for decurling (either finished prints or on the odd time when I need to use tail end of a curly roll). Roll hcc paper down bench, put curly print paper in face up, re-roll hccp. The roll probably weighs 10KG. decurls Prestige Baryta in around one minute. For really objectionable papers, you can tag the leading edge of the roll under the weight of the hccp, so the wrangling process starts with the roll caught in the nip.
This however doesn't seem to work for Canson Premium Lustre 310. Last 10m of the roll prints fine (on a roll fed printer) but never seems to lose the curl. So I wouldn't suggest a heavy RC paper being trimmed for a Pro1000...