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I only say change them as you chamois might disintegrate. Also if you're using chamois cream, unless you can wash them properly, it will not clean out. Also they'll stretch so your balls aren't so well supported.
You asked what you could send ahead. I didn't say you needed too for all of it. But those bits are about what's worthwhile.
I'd happily send my favourite brand of tyres ahead. Plus a nice snack in the box for a mental boost.
I'm not swapping a chain half way through, it's only 3000k. Tyres maybe, but I could just buy when necessary. I don't wear bibs and I'm not sure about changing them half way. Better to just have them melt into your festering skin I reckon. Tubes - shop, Snacks? I'll be eating all manner of shit so I'm not sure sending a cherry ripe would do much good other than psych boost.