I did just the same thing on my searider.
Firstly - get someone to help, that strake is really heavy to handle neatly by yourself....and will allow you to do one complete side at a time.
I cut the strake at the point of the bow, and stopped it just before the cones start.
I then concealed the joint by running a vertical section of strake with the D opened up to make a fairlead.
I am attaching a couple of pics that may give you a clue!
Good luck.... get some help!