@aaronocampo - 301 will not work her.
No way to create 301 from other domains (Only relative urls start with “/
”)
301 is for old URL-path, starting with a slash ==> new URL-path, starting with a slash
(URL paths not base/absolute domain!) - in other words no way by webflow to create 301 from:
https://webflow.com/blog
to https://nike.com/blog
(It also makes sense).
In your case for 500 posts you should Be careful (First try to create redirect only for one month or group of posts) - otherwise you will lose rank/SEO (Do not
shutdown the old WP site until you solve this idea). I am not sure this is not issue of Wordpress.
This trick/idea is wrong (Beacuse the base URL is diffrence).
Related :