I have a little unit that plugs in the cigarette lighter and I can plug in a stereo input and it broadcasts over FM. Then you just set the FM dial right to receive it. I think there are also more modern units that can connect from your phone, etc by bluetooth or similar.

If the deck you have works ok I'd just do that and then there is no need to replace it. I still use cassettes, I like them , no menus or other electronic garbage to worry about, or commercial advertising.

where I go to play pool there is a radio tape deck cassette player phono CD combo thing.. It isn't new or sophisticated.. someone plugged in a little box to it and those that have music lists connect their phones to it without plugging in, and stream their own music to it that way.

you could plug one of those it to the FM broadcast device or there may be a modern equivalent in one package.