antiX-15 is Debian Jessie base,
As for the input method of the Asian area, Fcitx is recommended in place of iBus.
I installed a development version of antiX-15 and made a try of Fcitx,
but confirmed the lack of some packages.
Please watch the person concerned closely in my performing a pull request for this solution in GitHub:https://github.com/AdrianTM/mx-packageinstaller/pulls