There are actually some good / easy shore dives suitable for an OW diver. The Conestoga (Cardinal) is in an easy 50' offshore in 30' of water. Current is very light.
SS Conestoga
The Rothesay (Prescott) is also in about 30' of water, 300' from shore with a good line running to it. Current on this wreck is also very light.
SS Rothesay Here is a video running down the south (US) side of the wreck I took on my birthday
Rothesay on Vimeo
Also in Prescott is the scuba park just off of the docks
Divers Playground Really not an exciting dive, but it is hard to get in trouble here.
Other than these, most other shore dives will be of the drift variety in current. You would want a guide. Many of these are considered advanced dives.
The same is true of most wrecks reachable by boat. Current can be an issue, and many are deeper than you may be comfortable / trained for.
Here are another couple of links:
Neptune: diving in Ontario
Diver Guides | Save Ontario Shipwrecks
Scuba Diving in Ottawa, Kingston and Brockville | Sharky's Scuba
I have done a number of dives with Luc and can recommend him.
Martin Dive Charters - Our charters
I don't know when he stops for the season. There are, I am sure, other good operations in Brockville as well.
Depending on work & weather, I might be willing to do a few tanks on the Rothesay or the Conestoga that weekend with you. Be prepared with at least 7mm and hood / gloves, I would be wearing my 7mm + 7mm shorty.
Good luck.