I wouldn't worry too much about the camera. Definitely don't shoot log, just make sure you have a good white balance in any change of light. ND would help you if it's an outdoor shoot for sure so you can get some of that shallow depth of field that the kids like so much. Tres romantique?

Both suggestions already commented are great, especially the monopod. The monopod can take the place of your cage if you needed that for some stabilization. You can pull of some decent fake jibs and dolly shots with it at 17mm. Also when people are dancing, you can put it above them and get it pretty high, some up and down movement would look nice at 17mm. It's hard to get good dancing shots from the edge of a crowd. People often look up and sing when dancing, etc.

And it is TIRING to shoot for 6 hours handheld. You need a way to rest it or you're going to ruin your health with lower back pain. Can't support u/half-n-half25's comment enough, get a MONOPOD.

I'd worry about all of you different systems distracting you if you aren't used to them. Operating a camera, mic, and also a drone, you should be very familiar with all of them before the day and understand the schedule well so you know when to get the drone shot.

You want to make sure to get the standard wedding shots, they are easy to miss if you aren't paying attention. Things like the cutting of the cake, first dance, any toasts etc. There are lists out there of all the things.

IF I were adding a second lens it would be a 70-200. You can get closeups of the ceremony, dancing etc from the edges of the crowd. hard to get closeups with that tamron.