Hey Rene,
I am sorry for the delay of this reply,
To be honestly, I am not familiar with this htaccess redirect rules, but I am not encourage to use this htaccess redirect rule because it will affected with your site performance issue, unless your site only got a few pagination, but i think that is not right?
I already consult with our developer regarding this, that is actually quite hard to provide a quick hack for this, because Easyblog has a lots of different page of pagination like frontpage, categories, tag, author, teamblog, and those single item page etc.
For now I will create a ticket in Easyblog 5.1 tracker, we will see if we can implement this to show SEF for the pagination in Easyblog 5.1.