It seems that with long hiatuses in new onscreen Trek ahead, genre coverage is starting to profile Trek novels again.
This set of ten weird but readable books isn’t necessarily the trippiest, but it does put the first of the Shatnerverse books at the top.
(Perhaps @ValueSubtracted@startrek.website there’s yet hope for Shatner’s wild imaginings to make it into S&S monthly Star Trek ebook deals promotional rotation.)