Agree that is tricky to figure out on the side of the road. I hope you did not think I was faulting you. I only mentioned it for your future and to help others who read this thread so they understand these are not coming off with a standard 6 point socket or box wrench.
I do use brake cleaner for bolts that look like that, let's you see what you up against, also gets off the oil and grease so its harder to strip the head. I have wondered why they even use that star bolt there, likely the PS box manufacture decided on that style. My son's 67' Ford Gallaxie has the same one. He got confused on how to get it off when he saw it.
FYI I keep one of these in each of my vehicles and a couple in each tool box for things like this. Has a magnet on the end to hold the flashlight for you when working on vehicles. Two levels of brightness, also flashes red for help or to save your bacon at night on the side of the road. I highly recommend these, I give them as gifts to friends and family. Later I always get a "thank you I use it all the time!".
https://www.nebotools.com/p/FRANKLIN-DUAL/809
Harbor Freight has a cheaper version for about $8 but does not have the flashing red or the second light on the top. They are basically the same thing and work really well too.
Harbor Freight buys their top quality tools from the same factories that supply our competitors. We cut out the middleman and pass the savings to you!
www.harborfreight.com
Glad to hear you are back on the road! What is the next stop?