What I get from that statement is that the stock weights will work for our elevation without the rivits.
So yes, you could just swap... but they don't have another set of weights in stock, so you are stuck drilling.
I would drill the rivits (given the stock weights will work) and have the dealer order another set of stock weights. Then, they can install the rivits in the new weights, and you can reinstall the new ones when you get home (set up the same as you had before you left).
2 sets - one for home, one for here... easy cheesy!