Yes you can evaporate it or you can salt your alkaloids out with dilute acid and then make basic again before extracting with shellite.. me personally I’d just evaporate the xylene as it keeps other alkaloids in the mix that shellite might not - however salting out of your xylene means you can reuse it for future extractions. Narrow phyllode acuminata is mostly just DMT though so freeze precipitation with heptane would be the best course of action. Diggers shellite is a terrible solvent.

If you have heptane I wouldn’t bother using shellite.

For 50g plant material 100ml xylene will get everything out and doesn’t need to be heated.