I gave the various solutions here a try, but have had almost no luck. The closest I got was with openbox, and tint2 showing an icon. I could click the icon and choose ibus-mozc but nothing happened. It also gave me an option to choose input method, I tried hiragana, but again, nothing happened.
Steps I took
Installed ibus-mozc. Set the variables in bashrc (and they worked, when I tried echo $XMODIFIERS and so on, it gave me the desired result. Ran ibus-setup (changing input to the old ctl+space). Ran ibus-daemon & (and also tried with ibus-daemon --xim & which has served me on other distributions in the past.)
Also tried the fcitx solutions but fcitx-configtool gave me no option to add a mozc input. I guess I can just hope that sooner or later, someone packages fcitx-mozc (or fcitx-anthy or kkc). Or I suppose I could just use translate.google.com and type things in there, then copy and paste it.
Is there an official way to request a package? (Though with a relatively small group, I suspect that unless someone with package knowledge is learning Japanese, there might not be a reply.) I don’t have the skill myself. I was hoping to find an fcitx-mozc tarball that could be built from source, but so far, I only see separate packages for fcitx and mozc, both of which are provided by void repos.
It’s about the only thing keeping void from being a perfect choice for me.