This is how you do It: Company town, no land sales, a charter that says a certain period occupancy leads to equity or transfer of ownership, only allow white employees with correct values to transfer to this town, hire blacks in the outside world working for same company, everyone in town are "remote workers in their own department, not a promotion you pay less for transfers. Maybe let in a few east asians to foil racism claims, massive NDAs, make sure the business has it's hands in things which have national security ties like defense or medical or biotech so you can actively discriminate against foreigners. In the charter anyone trying sell land must offer to sell it back to the company first in good faith.
Worst comes to worse, "this land is all in a personal trust, my closest 2000 friends live here for free. None of it is for sale.
Essentially just do neo serfdom/feudalism but trade equity in a private mutual fund for equity in a house, people can sell their equity in the fund and leave whenever and still have an HOA type org that demands a standard if home care.
It wouldn't be too hard to come with schemes for home improvement using this equity model.
Pitch your local billionaire white nationalists.
Maybe feudalism wasn't so bad.