Since it is unlikely to happen, a good option is to scrape together a down payment, get a long duration mortgage, dont do extra payments and save in btc. Most likely, you will win on the interest differential. Worst case, you sell your btc to pay off your mortgage or sell your house.

This is what I do, but was late to the game. This also gives protection against The Great Taking, which I believe is way more likely than losing money on btc.