To your first question, yes, you could do that.
to the second post
1) You mentioned “super admin”. It is impossible now, due to a change in WP to give anyone other than super admins “unfiltered_html”. Or at least nearly impossible. You can give them the permission, but it will be ineffective on the main content area for the site. I’m not sure if I figured out a work around for this the last time I ran into it or not. ACF seems to be working around this for acf fields.
2) It would be no heavier to run wp_kses() on each field than it would to run it on all fields at once, I don’t think.
