LuaTeX-ja

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The typesetting of kanbun is a complicated matter, which gets worse due to the overwhelming variety of the way the range U+3190..U+319F is treated in Unicode. However, it is possible to define how exactly kanbun is supposed to be rendered: in vertical text, in either lengthened em-boxes without vertical space, or proportionally, U+3190 centered, the rest shifted to the left, say, ㆒ and ㆑ fusing when touching etc. Another way (less preferred) is using tricky ruby. How does one typeset kanbun in luatex-ja? Is there some method already developed and preferred? Or the hack with manually tuned ruby I use is the best option?