I would start from scratch with bobtemplates.plone · PyPI and make then the necessary changes using p.f.recaptcha as a reference.
bobtemplates.plone includes the latest best practice from the Plone community including testing via GitHub Actions instead TravisCI.
This HCaptcha project looks interesting, but I'd also check if GitHub - collective/collective.honeypot already solves the problem with bots. It's not using any external service and does not bug people forcing to solve ambiguous picture riddles.