I'm sure the "perfect" post workout drink will continue to be hotly debated for years.
My current understanding is that
fructose (which makes up half of sucrose) is not harmful at all, but is primarily used to refill liver glycogen, not muscle glycogen. This doesn't mean you need to avoid it, it just means you still need to get some glucose(from
dextrose,
maltodextrin, cereals & grains, etc).
I'm assuming your Myoplex MRP has at least 20-30g of some form of glucose carbs, so added with your sucrose drink(which is half glucose), you're probably in very good shape.
If you want more carbs... I think Pixie Sticks (candy) are
dextrose. You can also just have bread/bagel, cereal, oatmeal, etc. Bulk Nutrition carries NOW brand
dextrose for $1/lb. You can also find bulk
dextrose at home brewing stores, if you have any of those near you. They use it to make beer.