WordPress won’t let me use a page slug of ‘feed’

That’s because “feed” is a reserved term (actually wp_unique_post_slug will match your page name against the rewrite rules).

You might be able to change this by removing the WP feed on init:

unset($GLOBALS['wp_rewrite']->feeds[array_search('feed', $GLOBALS['wp_rewrite']->feeds)]);

(maybe flush the rewrite rules after)

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