It is better to send such person for hajj badal who has already performed his fardh hajj. It is makrooh to send a person who has not performed his fardh hajj, though the hajj shall be valid. A person who can afford his hajj he should not go for hajj badal rather he should perform his own hajj first.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband