Disposable 35mm waterproof may be best bet - inexpensive and easy to use one handed. Of course you can't post pics online, but you could get copy of negative and get a mediocre pic for digital reference.
Problem I have w/ my Olympus 770SW is it doesn't allow enough of a wide angle at closer range: hold in at eye level pointed at my feet it may go to 36". I'm not that tall so if you are taller you may get 42". Even a fish with a huge gut that would be 32 lbs MAX.
I checked Olympus's specs and camera in terms of 35mm photography is 38-114 mm equivalent. You need 28 mm or wider for big fish up close.
If some one is with you they can take picture of you and fish before you free it, but otherwise you are out of luck.
Lots of time I am on my own and use my rod butt end for reference of length. I have 28" marked off and I know where half way length is for 2 pc rod.
Sometimes you can pick up an older lower resolution digital camera for dirt cheap and just keep it in a couple of ziplock bags and take it out when you need it and put it back (Olympus D340R for example is 26mm focal length). Low cost alternative. I found the 770SW for about $200 online (it can do a lot more than I use it for).