Needs trim ideas

So I am getting really close to finally being finished and getting out there my epoxy is almost cured and spar will go on next. My question is that since I am building a woody teardrop I have a few areas where the roof has met up and I want to cover with some sort of trim. The outside corners will be covered with flashing than normal rv insert trim. But on these cross joints I would like to cover with something.
My thought is that I have a roll of sheet aluminum to cover and be secured with glue however I have no way of clamping it down to lay flat over the corner. I have searched and search for flexible bendable seem Trim but can't seem to find anything. Any suggestions? See attached pictures.


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My thought is that I have a roll of sheet aluminum to cover and be secured with glue however I have no way of clamping it down to lay flat over the corner. I have searched and search for flexible bendable seem Trim but can't seem to find anything. Any suggestions? See attached pictures.



Sent from my VS986 using Tapatalk