Possible to create posts instead of pages in Gallery Settings?

Is it possible to make a new post instead of a new page on this screen?

Ideally, I’d like to make a gallery a new post with a custom category type so that I can automatically apply a theme and have the content be more native to my use case and other content. This way I can populate an RSS feed and lead to other automation in my workflow.

I know that I could finish the gallery and add it to a new post, but then I get back into duplicating efforts and not being able to optimize process and time.

perhaps there is a custom function i could make in my functions.php to accomplish this?