If the insurance company suspects that you've done something like this, they will wait until you need to claim (so they can take in the premiums) and then deny a payout on the basis that you formed a company purely to get round having been denied insurance. Every day, insurance companies look for ways to deny payouts, and they've thought of this one.
If you create a completely real company with the driving intention to get yourself health insurance because you can't or won't do it as an individual, it won't matter how real the company is. The insurers will decline to pay out.
