Ask HN: How to manage employee personal blogs?

We're a fairly new start up with 3 of our employees have come forward and asked if they can write a blog post, or record a podcast, about various technical subjects that might be nominally connected to the development of our product. So far, all of the subjects have been generic technical things (how to manage automatic SSL renewal and deploy to ACM, how to automate testing a native app, that sort of thing).

None of the stuff they want to post would expose any company IP, but our current contract wording is basically a blanket cover-all Silicon Valley contract which states anything and everything you produce or do as part of your employment with the company, belongs to the company, and you're prohibited from talking about any specifics related to the internal operation of the product.

Now obviously I can't see any particular reason why blogging about the above subjects would cause a problem, but we don't want to go down the route of restricting what our employees write about to a company blog (if nothing else because we don't have the bandwidth to check the articles), or gagging them completely from writing anything mildly technical on the internet.

I'm wondering if there are real examples of contract clauses where this has been solved, or how we might go about proposing an addendum to our Legal team, and what such an addendum might look like?