I do not have any personal experience with what you are suggesting but have used epoxy enough for other applications to suggest that it is not the best way to go for this type of application.
It is my understanding(nothing more) that epoxy works best when it is able to chemically bond to a surface, this will not happen with your canvas. As well it is a permanent solution that, if it goes bad, will not be easy to clean up.
I would suggest you buy a sewing awl and practice using it for an evening. What I mean to say is get some velcro and some scrape canvas and sew away. They are quite easy to use once you get the hang of it. Plenty of youtube video's out there to guide you along.
Sewing the velcro on would be the proper way to go and having spent the $'s on the dodger why not do things the same way a sail-maker would. Sure they would use a machine and charge you big $'s but as I say, with a little bit of practice you will finish with positive results.
See below for a example of a sewing awl.
Speedy Stitcher Sewing Awl Kit - Online Video Instructions for the Sewing Awl
If you do go the epoxy route, again I would suggest you "practice" Get some velcro and a scrape of canvas, epoxy away. Come back a day later and stress load the results(yank like hell) I suspect you won't be happy with the results.
Just my 2 cents, I have been proven wrong before and probably will again in the future.