weaning from mu sitewide tags plugin

Hi WPMUDev team. I’m hoping you can help me out. I’ve been using a wonderful plugin for years call MU Sitewide Tags. It’s authored by WP gurus Ron Rennick and Donncha O Caoimh. I’ve used it to aggregate my subdomain sites posts and display them on my main site. But I’d like to wean myself from it now because of a change in the way my site operates. However, I don’t want to change the way past posts work. Problem with deactivating the plugin is that it deactivates the permalinks on the duplicate/tags posts that redirect to the original post. The plugin hasn’t been updated in 4 yrs so the plugin authors haven’t responded to my query. Is there a way (or hack) to deactivate the plugin without doing that?