All that is possible, not easy, but possible. And you didn't ask if it was going to be easy. You will also need a third party application call Empower BES Mailbox to remove the BES mail from your main message folder to another.
But as stated above, first, think long and hard about it. As long as there is NOTHING in your personal email you want read in your company, you won't mind.
If you still want details on your prospective setup, post back here.