I posted that already earlier in this thread somewhere. The times you can try to do this things are over. If not you are in danger of police or more tax department actions.
Mainland Europe does not "buy" all this so called self employment schemes anymore that various operators are using(my previous outfit used that with UK and Irish pilots, my new one as well - I always steered well clear of that).
My suggestions - go for a direct (RYR) contract and have a good nights sleep. Tax evasion is a crime(and flying for only 1 operator is not an independent, it is being an employee. Sure you can add some lessons on lights or try to fly in your off days for an other operator, but RYR does not like that either for logical reasons). Always was. But this days it is threated more serious than in the old days.