Work is underway on vanilla https://github.com/pure-data/pure-data/pull/2086

Fantastic work! I've been working with pyext and pdlua before, but still most proficient with js

Regarding having an editor inside PD - perhaps the underused Tcl/Tk GUI plugins could come in help with this, will look into this!

will try to add maybe simple REPLish input first, some examples of the possibilities:
https://puredata.info/docs/guiplugins/GUIPlugins/
https://github.com/pd-externals/tclprompt-plugin
https://forum.pdpatchrepo.info/topic/9960/tcl-for-a-rainy-day