Yeah they may be stupid, but they'll learn a lesson Or they might have fun.
Just think back to 25 years ago and all the stupid backwards ways that you did things the first time. Works for me.
Also consider, plenty of river traffic on that section even that time of day & pretty easy access to the road for most of it.
I remember the days of tubing Pumphouse to Radium with no pfd, no wetsuits and no idea what the cfs was.
-another old conservative dude