Wanda's fancy and elaborate crafting tab has made me jealous 
and ive always thought Wormwood's tab was pretty bare-bones, especially in Hamlet where his Bramble Traps cant be used against bat waves. Mind you this is coming from someone who never upgrades to the Houndius-style hound trap and keeps using Bramble traps and bramble armor well into the "late game". I also make more living logs and Compost Wraps than i know what to do with just to make use of Wormwood's crafts 
The Root trunk seems to me like a perfect addition to Wormwood's tab. ive had this idea since the RWYS WW beta tuning. Obviously there are no bramble blooms in DST but i wont get into the specifics of the potential recipe although Lureplant bulbs are the most obvious alternative in terms of season-bound rarity etc.
Id love to see anything new besides the root trunk too, especially stuff that is more connected to the DST world, Bramble Husk and Traps have always screamed Hamlet to me. Recipes that are perhaps gated behind the celestial altars for example sound very interesting (Like walter's cursed ammo and pseudoscience), at least that way there would be SOME link between all the DST lunar content and Wormwood who was literally birthed by the Moon itself.
Edit: i forgot to mention, Wormwood lost his Poison Balm recipe when he came to DST without it being replaced by anything so his tab has gotten even more bare-bones in dst.