I work for a global enterprise company that transacts hundreds of millions of dollars via LE certs.
The B2B use case isn’t quite what I was referring to with respect to the type of trust required for first time or consumer transactions such as ecommerce. That said, this enterprise doesn’t sound federally regulated at all because if it were, it wouldn’t be using Let’s Encrypt.
Open WebUi supported a dozen or so search engines out of the box the last time I looked, most emanating from a feature request on github commented on by well engaged users of the software. If your fave search engine isn’t supported there are well documented how-tos on rolling your own. Check the community plugins as well - someone may have posted something, or an existing one could be adapted. GL