I think this will never happen on
lichess.org but all ingredients are there so I started
github.com/gbtami/pychess-variantsIt's in very early stages and full of bugs, but you can try it at
pychess-variants.herokuapp.com/It starts slowly because Heroku send it to sleep mode after some inactivity. You can play with Random-Mover BOT or with human if you can grab some partner there :)
You can choose westernized pieces for Xiangqi and for Shogi clicking on the upper right corner cog wheel icon.