Yes, canned veggies are "ok" - but not ideal. If you use them, rinse them before feeding. Most canned veggies have a lot of salt and preservatives in them which makes them less than healthy. You are better off using frozen mixed veggies if you can't get fresh vegetables.
The following thread that I made may help with ideas on safe foods to feed.
http://www.parrotforums.com/general...afe-fresh-foods-toxic-food-lists-sprouts.html
And I've also liked these two websites for eclectus
Land of Vos Eclectus - Main Page
Articles Eclectus Parrots - Eclectusville! Susie Christian Eclectus Parrot Breeder Rose Breasted Cockatoos, Solomon Islands, and Red Sided Available Now!
There are concerns about non-organic/imported produce, so be sure to wash whatever produce you do buy quite well!
Executive Summary: Eat your fruits and vegetables! | EWG's 2012 Shopper's Guide to Pesticides in Produce
Also, word of caution, the 15 bean soup mixes aren't considered 'healthy'. The cheaper beans contain a toxin that, if not fully cooked out, can be deadly to our birds (humans, too!) The 15 bean soup mixes typically contain kidney beans, which has the highest amount of toxin. These beans must be fully cooked for human consumption. If you look at the list of foods I provided, it has a list of healthy beans that can be fed cooked or sprouted, so far less worry about toxicity.
Phytohaemagglutinin - Wikipedia, the free encyclopedia
A lot to learn, but I'm sure you'll do fine! After all, you are already trying to provide a varied diet, and that's great!
And yes, best not to allow access to our mouths! As kc_y0 mentioned, our saliva can be deadly! In the least, it can give them bacterial infections.