IANAL but it should not be an issue, in theory. Most of those IP assignment clauses cannot be enforced in court. But your employer can still sue you and their w

IANAL but it should not be an issue, in theory. Most of those IP assignment clauses cannot be enforced in court. But your employer can still sue you and their war chest is likely be bigger than yours. Maybe to avoid any frivolous lawsuits, register domain name using gift card under fake name. And once you are ready, buy it from that fake account. Again if you are really worried, talk to a lawyer.