Keynote doesn't look horrendous.
https://www.youtube.com/watch?v=I8YEjI81NjA
or if you can't change, it seems you can do most stuff pretty quickly (view details for timecodes to specific functions):
https://www.youtube.com/watch?v=6MBkjFiE-9U
Issue with Keynote is that I'm often asked for the slides that I have presented, largely by people who use PC's, and I have found that when confronted with a Keynote file most go "WTF is this, pls send in Powerpoint".
Keynote will export as a pdf, send them the pdf. They have the slides in a format viewable on a PC. Job done.
@Dammit started
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Keynote doesn't look horrendous.
https://www.youtube.com/watch?v=I8YEjI81NjA
or if you can't change, it seems you can do most stuff pretty quickly (view details for timecodes to specific functions):
https://www.youtube.com/watch?v=6MBkjFiE-9U