Forgotten Swipe Pattern lock for Nexus 6P (but fingerprint works!)

I have a Google Nexus 6P with Copperhead OS installed on it. I forgot the pattern to unlock the screen. Is there any way I can recover (a part) of the data on my phone? I am pretty sure that the answer is going to be "no way", but I just want to ask to make sure, before I wipe the phone. I DO have a fingerprint in the phone, which works. Unfortunately - for some security reason - it wants the pattern as well. Maybe I can add, that I *kind of* remember the swipe pattern. I am sure about a middle part, but not about the beginning and the end. Unfortutely I have tried so many combinations by now (even keeping a book), that I have to wait 240 seconds now until I am allowed to enter the next try. (First I had to wait 20, then 30, 60, 120 seconds, now 240.) I had about 55 tries by now.