Give Dan a call at
https://www.andrewlakelodge.com/plan-your-trip/fishing/
There is a grass runway at Andrew Lake Lodge, and you could fly up from Fort McMurray. I recently got back from a 10 day hunting/fishing trip at South Leland Lake, which you could get to from Fort Mac on McMurray Aviation's amphibious Caravan. We didn't find any monster fish at South Leland, but I know Andrew Lake has monsters.