@andreasma made another post here (HCaptcha Support For Plone Available Yet) on the forum about the release of his hcaptcha add'on.
@andreasma Did you figure out the traceback and/or other issues you mentionned in this thread in June?
This week I added support for plone.formwidget.hcaptcha to collective.easyform. It's on the main branch, not released yet. It was mainlycopy/pasting the recaptcha integration as plone.formwidget.hcaptcha is a light refactoring of the plone.formwdget.recaptcha. (https://github.com/collective/collective.easyform/pull/293)
The easyform support for hcaptcha is not production ready though, it seems functional until it causes a validation error on form submission when the hcaptcha seems to have been completed succesfully.