Remove feed_base from RSS url – possible??

would like to remove the feed part of the rss url.

also, when using a prefix to the feed for a post in safari if you leave out feed in the url it stays at that url but using firefox it appears to redirect to the url with feed in it. eg.
https://domain.com/post-1/rss redirects to https://domain.com/post-1/feed/rss

rss must be reserved as if you create a page called rss using permalinks it appears as rss-2.

i have the following plugins installed and active:
admin-menu-editor
custom-post-permalinks
custom-post-type-ui
faster-image-insert
max-image-size-control
more-fields

i think the custom post permalink plugin adversely affect the rss feeds as i initially had the error in safari, “Safari could not update this feed because the source file is no longer available”. WP was outputting a 404 header while working in firefox.

ideally it like my rss urls to be:
https://domain.com/rss – main feed
https://domain.com/post-1/rss – page specific feed
I have the feeds working in this way but it has the /feed/ in the url. if i can remove it i want to – thanks.