there's no running away from tax man if his income cannot support the purchase

I would suggest that he get some of his working family members or friends to co sign the loan then it will not be so suspicious

why you want to "arouse" the tax guys XD the term you used very erotic -.-

anyway, there's no way in hell that you can keep the purchase of the property away from the knowledge of the government. there could be a way but it will be illegal already and i don't think there are any persons or solicitors who would risk their life/career for your customer.