Could try the transform equirectangular image mode to adjust the image so that the area you want to edit is in one area (say view position lower bar to -1.0) then mark out the area you don't want, erase it and fill the area in using something like the content aware fill plugin to edit out the tripod. Or if the content aware fill option takes too long try adding in another image similar to the area you are filling in (making sure its the lower image so not to cover over the main image) onto another layer then merge the two images. After that adjust the image back to its original form then save it might get the results closest to what it sounds like you are looking for (if somewhat time consuming).
Here's a equirectangular pic I did edited from a video I took on holiday once.
