n80,
I completely understand your feelings and am, pretty much, the same. I still use the turntable my father bought for me in early 1980s and the biggest reason is that it is "my" turntable I cherished when planning to buy it and ever since. Every time I get an itch to buy a new one, I realize it would not be it so I put a few drops of oil once a year and it still works. It runs on kryptonite, I guess. I barely use it, avoid it in some sense (records are very inconvenient, if you ask me), but could not let it go.
In your situation, I would just buy decent floorstanding speakers, again some Wharfedale or similar within a budget, and stop thinking about major improvements in sound. I doubt you go to your cabin to sit in front of the speakers for more than a minute or two. Just crank it up, and enjoy everything else while music is playing. Think of your home system as a "hobby" or "serious". This one in cabin a "guilty pleasure". What the heck, it is all processed sounds and "realism" in that setting is actually faked anyway. The things around you are real, not what comes from speakers, no matter how good the system is.
Loudness button is another thing we share affinity for. I rarely use it, but feel good knowing it is there and indulge in it from time to time. Everything sounds better with loudness button. More realistic. Exactly the way it sounded way back when...your, and my father bought us these things and that is what counts to me. Who ever listened to Poppa Joe without loudness? Some memories, time cannot erase.