All three would be a pinch difficult MM, but for the firstly, one would hope that the ini file would be able to do it, but alas, it does not look like it can. The "noise.ogg" file is the one you hear between stations. It would be nice to have a "phase-shift" when tuning into or out of a station, and then that noise start, but also, the noise is the same, no matter where you are on the dial, or in the world, and could stand some variety there also. It is possible to replace that file though, and have a longer fade-in at the start, but it "sounds" like it is designed as a "loop" playback file.
The secondly, click and buzzing and then a tinny voice or music sound coming in then stronger and deeper as the tubes warm-up would be cool, but you would have to "hook" the "power-on" somehow. What else would be cool is the power-down cycle as the tubes cool and the sounds fade and gather distortion on the way. I don't know how one would do that though.
The thirdly is probably the "easiest" in finding a few different needle sounds, and then just appending one to the beginning and / or end of each of your audio files, and just make part of that playback, such that a 3 minute and 2 second song might have an extra 12 seconds up front of the needle "hunting the groove", and then 4 seconds on the end and the needle goes out to the return groove, for a total of 3 minutes and 18 seconds of the song. If you have something like Sound Forge or any other editor that does batch processing, you could set it up for a bunch of files to have one needle noise added to each, and then another batch for the next set of files and a different noise. The "problem" with that is that each time a given song plays, it always has the same lead-in and outro sounds. But definitely do-able. I have that sound on several of my old LP transfers to R-T-R tape, and the tape then years later transferred to computer and digitized many years ago. I ~think~ I have those on the big computer downstairs here. The main difference between my records and those of the forties would be the rpm used, of course... 78 vs. 33&1/3, but most audio editors could speed that up for a person also. You could have really worn records, or almost-pristine ones also...
Edit: I must have deleted some of my files as I got CD copies of the phonographs over the years, and I only have 8 songs left of the rips I did back when. Only one sounds bad, most of the others you hear the needle, but not much, and the one, you cannot hear a needle at all hardly. I did find this though:
https://orangefreesounds.com/record-...e-needle-drop/
I searched on "record needle noise sound effect" online and found a few other interesting ones. None sound like my moms old 78s though. I don't think anyone in the family still has those... Some you could tell were played quite a bit more than others, but none of hers were really all that bad...