There is a thread on this forum
here (clicky) about the perils of a damaged speaker.
If the screws are stripped - or their holes are - it seems like you could just carefully pry off the speaker with a stiff putty knife and then repair or replace as needed.
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There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch