How soon can I do HIFU after facial fat grafts?

I had fat grafts on the front part of my cheeks & nasolabial area about 3 weeks ago. I read that most of the swelling will disappear by the 6th week. Will it be safe for me to do HIFU or any other non invasive face lifting treatments then? Since most of these treatments break down fat as they lift, I'm worried that the fat injected into me will dissolve from the lifting treatment. And yes I've asked my surgeon,but because he's very old he's not familiar with HIFU & the likes, so please advise me