This add-on provides a flexible framework for you to add AMP-support to your forums.
Under the hood, it provides alternative templates (suffixed with _amp) that meet AMP's strict validation requirements. These templates can be modified at will to offer different experiences for your AMP users versus regular ones. AMP'd versions of pages are available at a specific link and this link is exposed to Google.
Out of the box the add-on will attempt to provide an AMP'd version of your style but on fairly complex styles, this may not always be possible so some manual modifications may be needed. Support for this is not explicitly provided and is instead offered as a best-effort and in my own time. Generally though, you shouldn't have too much issue.