Excellent news from Silvio Grosso, who linked to a job advert in July (now sadly expired)…
the French G’MIC team has hired a developer who will make G’MIC with Photoshop as a .8bf filter. Starting work 1st October 2019 and with the post sponsored for a year.
G’MIC is the excellent filter set in GIMP, and (as a Krita-specific fork) in Krita.
Update, December 2020: Now mature as gmic-8bf.