Personally, I wouldn't pack it that way because you will either end up with a lot of "extra" or you will throw a lot away, but that's just me. Some diaper changes I use one wipe, others I use 4. If I were packing that way, I would put 4 in each bag, but then what do I do with the extra? Throw them away or end up with tons of extra wipes in the bag? Also, those disposable changing pads are really expensive. Buying the store brand, I think I paid $4-5 for 12. If I change 6 diapers a day, I would have to buy (and pack in my suitcase) $20 of disposable pads for a week.
Although I agree this way sounds convenient, it may end up to be more of a hassle. I have used two ways, and I'm not sure which I like better. One thing I did is to have each kid have their own tiny backpack instead of one big diaper bag. That way it fits into the bottom of the stroller really easily. Then, each kid had what they needed for the day in their bag. So, YDS (the one in diapers) had a travel pack of wipes, 2 disposable changing pads, 6 or so diapers, a change of clothes, and a sippy cup. When I went to change him, I could either open the bag and easily find what I needed to bring or I could grab the whole backpack since it was so small. I would reuse the disposable changing pad unless it was soiled, and then I would replace it with my extra. The other "method" I used was to use one of those "diaper and wipes" clutches that pps mentioned. I would keep the travel pack of wipes and a couple of diapers in there and use the plastic changing pad that comes in the case. Since the clutch had a snapping handle, I would just clip this on the stroller and grab the whole thing when I needed it. Then, as diapers were used, I would replace from the big bag. Both worked well for me (not sure which way I'll do it this time) and required little to no advance planning.
How exciting that you leave so soon! I'm excited for you! Have a great trip.