Fairly certain that you can use xylene/limonene to extract jungle spice after an infinite number of heptane pulls. I say fairly because this doesn't make sense to me being that I've seen that jungle was chromo'd to be primarily N,N-DMT. Anyhow, conventional wisdom says yes you absolutely can. Simply drain off any remaining heptane in your basified MHRB, and add in the other solvent. If it doesn't work for whatever reason, please let us know. I would advise against combining the heptane pulls with the xylene pulls, keep them separate.