Let's Encrypt: Is there a workaround for the 2021 SSL "cutoff" for pre-7.1.1 Android devices?

In January 2021 all devices with Android prior to 7.1.1 will not be able to connect to HTTPS servers using Let's Encrypt certificate ([Let's Encrypt blog post explaining the details](https://letsencrypt.org/2020/11/06/own-two-feet.html)) Is there any workaround that's system-wide (i.e. all apps, not just a single app, like using Firefox) for the SSL certificate expiration on Jan 11th 2021? Assume that one has root access to their device, and that upgrading to a newer device is not an option.