Jeff, it sound like you already have weight issues and adding twin 4 strokes will likely make things worst. If you are not willing to consider a more weight effective single I would go with the lightest 2 strokes I could find.
The only other option I would recommend is a big single with an auxiliary motor that you could store up front. Much less costly and offers the same security. I went this option for a few years until I got tired of the extra weight and now it lives in the shed under a tarp. I fully understand your concerns for the distance you fish offshore. Like you my average round trip out into the lonely gulf is 120 nautical on a light day. In the end you have to be comfortable with your equipment but redundancy in power has a steep consequence curve on a small boat.
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