One big problem.
Unless California’s citizens renounce their US citizenship, all US residents will retain their US citizenship, despite California no longer being a part of the US.
The US should stipulate that if it allows the vote for secession to take place in California, and the vote succeeds, the following four stipulations must occur.
One, if the vote fails, California will be split into a minimum of four states, with Jefferson being the northern most.
Two, once a votes takes place, only those Congressional Districts, where a majority of voters, vote for secession, will in fact secede. All other Congressional Districts will remain part of the US.
Three, all US citizens living in the seceding districts be given the choice, before secession becomes final, to migrate from those districts, and in so doing, receive just compensation at fair market value, from the state of California, for their property. This would include an additional $100,000 payment for each family member, to compensate for the mental anguish, for having to move.
Four, those choosing to remain would lose their US citizenship permanently.
What you propose is really excellent. Will you consider emailing the DJT Team so they are prepared with your suggestions?