You can download an example here:
https://www.dropbox.com/s/a2ppqjjhu9dzsr4/Endnotes%20with%20columns.indd?dl=0

I don’t think you can do this with footnotes. But endnote frames can be placed everywhere on your page, though it may be a little time consuming to put that all together …

If there’s an object in the pasteboard and you cannot see it, go to the layers panel.

Maybe the font has alternative glyphs and you can switch between them with stylistic sets?

In InDesign magazine issues 95 and 105 you can read everything about footnotes and endnotes. With the new endnotes you have the option to let them flow from story to story.

https://www.youtube.com/watch?v=7KWtVwB8qic

I’m not aware that InDesign does automatically create a superscript glyph for the ™. In most fonts this glyph is designed as such. Can you look in the glyphs panel? Maybe you just need to choose another font that contains this glyph in normal size and position (it’s a little better in Cabrito Sans, Futura, Gill Sans Nova, Neue Helvetica, Neue Kabel, Real Text Pro, Rival Sans, Tosia, for example, and it’s quite normal in size and position in Adagio).