Hmmm...solo...150 pounds...54 degree water in Lake Michigan below 6 inches... old Hobie 16 with (old?) shrouds....
Please read the thread on Hobie Tiger righting and righting systems including PowerRighter. Then buy or build a system and learn how to use it in WARM WATER.
A Hawaiian style righting system won't help a 150 pound solo sailor enough. I ran mine outside the pylons to use it 99.9% of the time as a chicken line. New wires and Mast sealing are absolutely critical.

Otherwise you are referred to a thread on this forum several years ago about a similar H16 sailor who loved going solo offshore Cape Cod by himself. Sadly, he did not pay attention to anyone's posted suggestions about righting gear, wet suit, weather, time of day, etc. but was happy jumping waves without all that attention to detail.
After a few weeks, he qualified for a Darwin Award, and is no longer with us.