Is it possible to change buddypress group forum permalink structure?
Like : example.com/groups/sample-group/forum/topic/%post_id%/
last part will be %post_id%, instead of /%post_name%/.

The default structure is creating problem in some languages. I used Persian to the topics name. Link looks like:
http://team.joyofpersian.com/groups/via-stories/forum/topic/%D8%A2%D8%AE%D8%B1%DB%8C%D9%86-%D8%A8%D8%B1%DA%AF-%D8%AF%D8%A7%D8%B3%D8%AA%D8%A7%D9%86%DB%8C-%DA%A9%D9%88%D8%AA%D8%A7%D9%87-%D8%A7%D8%B2-%D8%A7%D9%88-%D9%87%D9%86%D8%B1%DB%8C/

I am using the latest versions of WP, BP, bbPress
I tested these plugins:

• bbPress Permalinks with ID
• Custom Post Type Permalinks

both work correctly in forums that are not associated to a buddypress group, the link is like:
[sitename]/forums/topic/[topic-id]/
but when forums are associated to a group, the link is like:
[sitename]/groups/[group-name]/forum/topic/[topic-name]/

I found the same question in this topic, with no reply:

[@djpaul Keymaster 6 years, 11 months ago]

If you’ve found a way to change the permalinks directly via bbPress (the /forums/ permalinks), then you know the plugin’s worked. If they’re not working for the permalinks on the Groups Forum screen, you’re probably out-of-luck.

Unfortunately, most of the permalinks through BP are hardcoded and are very, very tricky to customise.

[@ironi2002 Participant 6 years, 11 months ago]

Thanks Paul

I hope you are doing well.

• I read this topics: https://bbpress.org/forums/topic/change-the-permalink-of-topics-from-name-to-id-bbpress-plugin/ and according to JJJ, future versions of BP will use proper rewrite rules.
• I also followed the BP trac and found ticket 4954, it seems this ticket is awaiting contributions.

There is still no sign of this long-awaited enhancement.

Best Regards