I would NOT recommend that you try to use the moving promotion for a temporary two-month situation.
As the former Bell TV agent should know, this could cause several headaches for you. Once you move, you change the Bell TV account to a BC account. If you're on One Bill and receiving a Bundle discount, you will lose that discount for your tv. You may even jeopardize the discounts for your other services.
Then, you'll have to change back when you return to Ontario. You may have to wait a couple of billing cycles for bundling to take effect. Plus, you may be charged the processing fee for putting the tv service back into the bundle.
There aren't a lot of installers for Vancouver Island, anyway.
If you can move and point your own dish, you may want to do it yourself, to save yourself some potential problems and phone calls. Remember though, it kinda goes against your service agreement.
You could just put your account on TPS and do without TV for the summer. You may enjoy it.