You can buy or take mortgage on something, paying directly with LN or tether (which can be easily purchased with LN) or first convert to physical cash and pay with that. If it is too hard to do in some country, just move to another one. There are plenty of countries where they don't really care where you got the money, e.g. Thailand or UAE etc. Otherwise you can legalise the money in a country, where it is easy and then officially move it to the country where it is hard.