My main concern is whether dofollow is interpreted as more important than links without any
rel attribute. Does it make any difference for search engines?
There is no such thing as "dofollow". All links are followed unless specifically stated otherwise (nofollow).
What some people call a "dofollow" link is just a normal link - i.e. a link that does not have the
So, what you want is simply something like this:
There is no dofollow (or similar) attribute you can add to the link. The absence of
Note: this answer was loosely based on this answer at Drupal Answers.