You could always create a plugin which “hides” certain posts from the forum front-page/forum pages. I don’t think there’s anything available that does that now… the closest I’ve seen is this bb-Pages plugin:
https://bbpress.org/plugins/topic/bbpages/
It was broken for a while, but it looks like someone posted a working version a few months ago:
https://bbpress.org/plugins/topic/bbpages/#post-4768
Good luck!
I already know that plugin. In fact I found the operative version of the same and I proved it. It has some deficiencies that I did not like. I rejected to use it. I do not understand the reason bbPress does not include the use of static pages. He is not so complicated. On the other hand, I prefer not to use plugins, if I can avoid it. For that reason I prefer to find another form through some function that I can incorporate to the code of my template.
Thank you