Should I be worried?

[Prisoner62113]

I'm sure someone else has come across this before. I've noticed several cracks in the rear wheel of my transalp. They all appear to be on the outside but I can't really tell how deep they are. Inside the rim there doesn't appear to be any corrosion.

But there are a lot of them. Some pictures are below but all together there are cracks around about 10 or 12 of the spokes and numerous hairline cracks elsewhere on the rim.

I am meant to be leaving on a six month trip in a couple weeks and would quite like to avoid having the wheel collapse in the middle of a desert or on top of a mountain. Should I be worried about that? Should I try to get replacement wheels or just ignore it? Or any other creative suggestions (a combination of welding and gaffer tape has already been mentioned)