I have an account with Collections Canada, so I may be of some assistance.
I set up a publisher account with CC online, which was really easy and it took far less than the 10-15 day wait they tell you to expect. You don't get ISBNs in blocks the way Bowker issues them (as I understand)--you generate one ISBN at a time (it's instant!) and fill in the required fields. You don't have to use your legal name at all; just register it under your pen name and you have an option to list whatever imprint you choose, if you don't want your book listed as being sold by CreateSpace or Amazon Digital Services.
You can use the same Collections Canada publisher account for different pen names. You're assigned a unique publisher prefix in the numbers, but that's the only identifying information. My book's ISBN is registered under my pen name for the three ISBNs assigned to it (Smashwords requires a unique ISBN, I have one with CreateSpace for the print edition, and a third for everywhere else).
As far as I know, the only time you have to provide identifying information is if you're submitting your book for legal deposit with the Canadian National Archives. My first two books were published years ago, under a variation of my legal name, and the CIP information on the copyright page listed my legal name and year of birth per Canadian publisher requirements. As the latest book isn't being submitted for legal deposit, I don't have to let everyone know how old I am
It's been a while since I set up my account, so I can't remember what it asks for specifically, but I believe you have to register it under your legal name and list your contact information. None of that is public.
You can register for an account here:
http://www.collectionscanada.gc.ca (Warning: Their site is difficult to navigate. Just putting that out there!)
I hope that helps.