How to work around the issue that I can't access some iStore apps of a different country?
You can make an separate AppleID for the other country.  You can load things from multiple AppleID accounts onto your phone at the same time, but it can be a bit of a pain as it will leave you in the account you were last in and you may inadvertently get new items into a different account than you intended.  Updating can be a pain, as it will require you to switch back and forth.  

But, you will be able to get the apps (or other items) that are only available in the other country.