I would like to buy Minecraft (java version) for the Mac soon. Now the question: Can I somehow access 2 accounts / gamertags (without paying anything?) For example, my name is anonyminus123 and anonyminus321, with 2 different multiplayer savegames.
No.
Just buy a 2nd account.
If you don't have the money, you should always find a friend who gives you his.
Okay thank you very much