UPDATE01: Sorry, I forgot to add the following in the title: "without regionswap".
Easy, but do it at your own risk. Remember piracy is illegal:
1-Install the legit CIAs with your favorite method.
2-Download and put the MT-card launcher in your SD card.
3-Launch MT-card launcher through DS-profile exploit and select Classic Mode.
4-Open your installed legit CIAs of other regions.
5-???
6-Profit
Proof of Concept
Easy, but do it at your own risk. Remember piracy is illegal:
1-Install the legit CIAs with your favorite method.
2-Download and put the MT-card launcher in your SD card.
3-Launch MT-card launcher through DS-profile exploit and select Classic Mode.
4-Open your installed legit CIAs of other regions.
5-???
6-Profit
Proof of Concept