DXM could give a ketamine-like experience, though probably less intense and less paralytic. Unfortunately it's impossible to get now in pure form.
Ibogaine is regarded as dissociative by some.
PCP is dissociative but too dangerous to be worth trying IMO. Other than K you don't have a lot of choices for dissociation.
If you like visual
psychedelic trips on the other hand....
mescaline,
LSD,
LSA,
2C-B and the other 2Cs,
DMT and its variants,
DOM, and anything else you can dig up that acts on the 5-HT2A seratonin receptor is what You wants to be investigating. There's plenty of options, though few are as wonderful as
psilocybin.