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Thank you, Peter.
I'm already using the select field for content_type in my form, it's just that all of my posts are being saved as standard posts, which is the bit of nuisance I'm trying to clear up.

Your code looks like it should meet my needs, but let me make certain I have this correct, as my PHP is not nearly as good as I wish it were.

As I gave the post types and the content types the same name but not the same slugs, let's assume I have two post types, Flora(flora-post) and Fauna(fauna-post), with corresponding content_type terms Flora(flora-post-type) and Fauna(fauna-post-type) would I do this:

add_action( 'rwmb_frontend_after_process', function( $config, $post_id ) {
    if ( isset( $_POST['flora-post-type'] ) ) {
        $post_type = $_POST['flora-post'];

        $my_post = [
            'ID' => $post_id,
            'post_type' => $flora-post

        ];

        wp_update_post( $my_post );
    } else if ( isset( $_POST['fauna-post-type'] ) ) {
        $post_type = $_POST['fauna-post'];

        $my_post = [
            'ID' => $post_id,
            'post_type' => $fauna-post

        ];
}, 10, 2 );

For others still looking for an answer here, this topic might help. I haven't tried it yet, but it seems to be better explained.

That would be great, unfortunately, none of CSS styling I've tried has worked and I'm pretty experienced with CSS.

Please, are there any other ideas for this? I would really like to be able to make this work.

Thank you, I think this would be an awesome addition.

I also think it would be nice if you could add more granular conditional logic choices that not only allowed you to show a particular field based on another field, but also to show or select specific options within that field (specifically select fields). For instance: if select field fruit option = apple then select field color options = red, green, yellow, but if select field fruit option = grape then select field color options = red, green, yellow, purple.

But can I make them horizontal instead?

Awesome! Thank you!