well the riddle cave trick is already here for over two years, so a nay as far as gaining premium with this submission
with everything getting easier the normal flow would be do your tal bruinen quests, killing every crawler you walk by
then as mentioned go to the little lake by the named worm (not the one by the waterfall) there is about a 2 to 1 ratio of worms to crawlers plus I think the kill count is less on crawlers as back in the day you could only find them behind thorenhad and they shared the same spawn points of bears....
complete the worm deed, of course killing every crawler you come across
_then_ finish up at the riddle cave killing the three spawns leading to the "mama" crawler who spawns two ally crawlers kill only the two ally crawlers run back to the railing by a mound of dirt, the "mama" runs back as soon as she turns tail
follow her back where your presence will spawn two more allies
rinse and repeat
there is also a trick with the named worm by the waterfall, but you usually have to kill non worm or crawlers so not very time efficent compared to riddle cave
anyway fighting the named there, the named spawns two allies of much lesser hit points, who none the less count for worm slayer deed.......