First, you should know that most boat fires start at the shoreside receptacle. With that in mind, you should be conservative with what you are planning.
25' shore cord is short and most are 50'. Did the previous owner make the cord up? I am not a fan of DIY made-up cords. To me, the cost of a manufactured cord is cheap insurance.
When we bought our boat and after some reading, I put SmartPlug boat side receptacles & cords (
https://smartplug.com/) on our boat. Easy DIY project and with a twist lock shoreside end you can connect a standard shore cord to get up to 100'. I have 1 but haven't used it yet (about 10yrs of having it).
I didn't see if you had a 30 or 50A boat but with 2 -30A (1 for the house & 1 for A/C) we also carry a 50A splitter for those times a 50A is the only shoreside receptacle available.
I also carry a 100' 10g extension cord and used it in Canada once to connect to a 15A outlet that was on a dock. Couldn't run A/C but in Canada, even in the summer, A/C wasn't necessary. With adapters, you can set yourself up to connect to almost anything.
We are on the Loop & I wanted & needed to be able to meet and attach to just about any connection we might encounter.
In closing, I might also suggest that you consider the addition of an ELCI. Marinas are installing new pedestals that are ESD compliant and it would be a good idea (the 25' shore cord has me a little worried) to have your boat checked over before an ELCI is installed. Reverse polarities could cause you issues down the waterway.
BTW, we bow in all the time and usually do a port side tie due to our boarding gate.
I see you are in Rock Hall, an interesting approach to that spot. Been there several times.
Good luck with your boat projects, they never end. Let me know if I can be of any further help.