I'm sure you have searched Google maps. The two most convenient places I see would both be on Provincial road 243 (highway 105 on the US side). One is Camping Nature Plein air, 2 or 3 miles from the border and about 32 miles from the Abby. The other is Camping Lac Trouser Inc, and is about 14 miles from the Abby.
I will have to remember this If I ever travel into the area. I do want to visit PEI, Nova Scotia, and Newfoundland (basically the Canadian Maritime region)