Wordpress Plugin for setting pages as deleted 410 status

I’m currently using the word press redirect plugin to redirect old URLs to the new URLs. The redirect has been in place since Dec 2023 so over 1 year. Im looking to now set the old URLs to deleted so they are removed from the google index. Weirdly in my GSC i have around 200 pages not indexed which are all these old URLs which have been redirected. I would have thought GSC would have cleared these by now. So i guess i need to give it a helping hand. Can anyone advise the best wordpress plugin i can use for this task ? Does Yoast premium allow for this ? I know it has a redirection manager but does it allow to set URLs to 410. I’m looking to to export the urls then hopefully mass import them into a 410 plugin. On a side note, does anyone know if these old not indexed urls in GSC will affect SERPs ? All URLs are currently redirected to the relevant new URL. So maybe there is a bug in GSC to flag them as not indexed. The main motivation to tag them as 410 is I suspect these are affecting my SERPs position. As no matter what i do to improve SERPs has no affect in the last 6 months. Thanks in advance for comments.