Adding podcasts to iPod from new Mac without syncing entire iPod

I recently bought a MacBook Pro (2019) and I want to update the podcasts on my iPod nano (7th generation 16GB). I don't want to lose the music I already have on it. When connected to my MacBook Pro, I ticked the Options in the General tab called 'manually manage music etc.', but when I go to the Podcast tab I can only tick on the 'sync' option. When I do that it prompts that it will sync all my music, and I don't want that. Everything else is greyed out, so is there a way to update my podcasts without losing all my other music content?

I asked this question two weeks ago as well (22/4), but the answer was no good (referred me to a page on how you can sync your iPod, duh, that's NOT what I'm after, I just want to upload recent podcasts, without it automatically syncing my entire iPod, and thus deleting the music I currently have on it...). Hope this goes better....