Can your file manager put shortcuts to particular files or folders on the desktop? Most can, so you should be able to put a link to the top directory of the sd card there (removable card, not "sdcard" which is actually internal storage). I don't think it will matter what card you insert because the path to it is the same.
The android desktop is provided by an app called a launcher, and you don't have to use the one that came with the phone. In principle there might be one that does this sort of thing for you, but I've not met it if so (though to be fair I've not looked, because I'm the opposite and try to turn such things off on computers! )
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