Hard requirement: Make the Wetware CPUs purchasable in the black market if chased out of the arcology. In other words, allow for markets to exist in places not attached to buySlaves.
To do this, you pretty much have to decouple the market code from buySlaves, which is likely what you will end up doing in the process.
Paternalism FS will ban wetware, since their practice is to remove parts deemed unnecessary for a slave. They sell slaves that have career backgrounds but are full of chemicals and very unhealthy and quad amputee. Good for getting facility leaders.
The slave shelter does not get removed, merely refuses to give you a slave if you degrade the previous slave badly or sold the slave, or enslaved the inspector. You get to deal with them again over time as the timer ticks down.