then add the HCl to water with activated charcoal and boil all the water off?
No, the solution of your alkaloids in 1 M HCl is already 95%+ water, so just add activated charcoal (perhaps 50 mL loosely packed coal powder per liter of solution) to the solution and bring it to a boil with stirring, keep it there for a few minutes, then allow it to cool down, still with strong stirring. When the solution has returned to room temp, you suction filter the solution to remove the carbon dust (preferably through a layer of celite put on top of the filter paper, as most filter papers allow carbon dust through) and wash the filter cake with a little water. The filtrate is then transferred to a separation funnel, the solution basified with NaOH solution and the liberated alkaloid freebase is extracted thrixe with a non-polar solvent.