Kayak Launch Site near Little Deer Isle Maine

I will be working with the MITA cleaning up invasive plants on the Barred Islands in Penobscot Bay in June. My plan is to stay on Butter Island for 2 nights. I am looking for a kayak launch site where there is overnight parking that is a 3 - 4 miles paddle from Butter Island. Any help appreciated.

How about the causeway between Little Deere and Deere isle. The question is whether they permit overnight parking?

The Causeway is only for daytime parking. But thanks for responding.

Naskeag and Old Quarry have overnight parking but are way more than four miles to Butter. Perhaps call the owners of Butter to find out if they have launch arrangements with a mainland shoreowner nearby.