Hello there pickpocky. Good day and thank you for the inquiry. Since this is a 3rd party accessory for the DJI Pocket 2. I hope that you will get the best recommendation from our fellow DJI co pilot on where to purchase the said Wide Angle Filter and share there experiences using it as well. Thank you.
You can't stack filters and lenses due to the strain on the gimbal motors. I don't know of anyone who combines the two in a single attachment. Personally I don't think the wide angle lens adds significant width to the image, so I'd choose the more essential ND filters rather than the slight extra width. YMMV of course.
DJI hasn't released such a set, however nowadays there is a third-party solution from Freewell that includes both wide-angle lens and ND filters without straining the gimbal motors too much. See https://www.freewellgear.com/131 ... ocket-2-accessories for more information on them.
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