I have found this free resource that requires no sign-up but does need attribution:
https://visualpharm.com.
It has a Tag-based Search and you end up with a link like
https://visualpharm.com/free-icons/f...tional%20flags
I have checked that any SVG download, if dragged into a design page of any XDA from version 10 to current will be presented as a Grouped number of shapes.
You could even use Import from Web Address; in earlier versions, you need to strip off the https:// protocol.
What I enjoy is right-clicking the selected icon into a New Tab and it presents as a full screen SVG so you can give it a detailed once-over.
As they are no longer SVGs in the XDA and you have the editorial means to alter them, I leave any attribution to your conscience.
In earlier XDAs, individual shapes or groups are still rendered as images.
You only gain true benefit with later XDAs that handle WebP and, especially, SVG outputs.
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