The answer to Horizontal placement of footnotes in beamer shows how to have two columns of footnotes in beamer, but it doesn't answer how to have footnotes in a single paragraph separated by commas.
footmisc does not work with beamer.
How can I redefine or patch commands to allow footnotes in the format desired?
beamerbaseframecomponents.sty seems to be the file to work with, but so far I haven't had success editing things. I've made footnotes disappear, changed fonts and spacing, but I just can't put it all on one line!