Is there an easy to visualize all the content I have downloaded on my Apple ID?

I need to to change the country of my Apple ID. The problem is that if I do so all the content that I have downloaded won't show up anymore on the "purchased tab", which is very annoying, so I was wondering if there is a quick way to visualize all the content that I have already payed for and saved it on a file, so every time I want to download a paid app I can go and check in this list if I have already payed for it.

I understand that on iTunes I can see all the apps I've downloaded but it would be just impossible to get all this data from there manually(possible but it would take a LOT of time).

By the way... why the purchased tab clears out if we change the country linked to the AppStore? I understand that for most people this is not an issue since most people will not move countries. But I don't see any technical difficulties for allowing such a thing.