Hi Hermski,
Chatted to our SEO guy and his view is that a 307 (in theory) works exactly the same as 302. It’s stating that content was moved temporarily.
If in fact it is not a temporary but rather a permanent solution then he strongly suggested using a 301 instead.
He couldn’t see a reason why a 307 could do any harm to your site but it’s always better to be safe rather than sorry.
Shane