I would actually like native lujvo for sports, and I don't mind them being
a little arbitrary, as long as the alternatives are reasonably dealt with
(maybe golf would be kevboijvi for example).

English does that: foot-ball, hand-ball, volley-ball, basket-ball,
soft-ball, base-ball etc. It would be interesting to check if there are
native names for these games in other languages that don't follow the
English ones.

With extensive consideration, one could convincingly propose a rich
vocabulary.

In fact, lujvo can be more neutral than fu'ivla, since we don't have to
commit to a specific foreign pronunciation.