Eyepiece Strategy

I have a 4 mm HR planetary, a 6 mm "gold line" and a 25 mm Svbony Plössl, all in 1.25". These eyepieces seem to cover a lot of bases (300x, 200x, 48x magnification), but I'm wondering if there's anything I could get that would give me more observing options?

I have a 200/1200 Sky-Watcher Dob, and the focuser will also accept 2" eyepieces. I've been looking at this [2" 30mm 80deg wide angle](https://www.aliexpress.com/item/32799918929.html?storeId=2801114&spm=2114.12010612.8148356.8.3e48242bCeSZI1) and this [2x Barlow](https://www.aliexpress.com/item/32798818152.html?spm=a2g0o.detail.1000060.2.598a3f99f8PupS&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.139618.0&scm_id=1007.13339.139618.0&scm-url=1007.13339.139618.0&pvid=2957e02c-0fd6-4ec2-bf46-a3f3a8f6e129) \- I don't have a Barlow yet, and also no 40x and 80x magnification. Also, 80 degrees field of view sounds quite awesome.

I don't quite understand if the Barlow will work with 1.25" eyepieces - the descriptions says an adapter is included - or if there are any drawbacks in using the 2" Barlow with 1.25" eyepieces.

Or are there perhaps other eyepieces I should be looking at?