Upvote:0
There isn't any way. Airlines within an alliance don't steal members from each other. So they don't offer transfer at the same level. I tried it from KE to AF, and was told it wasn't possible.
I've seen this with airlines of two different alliances: for a while SQ offered the same membership to CX members. I took advantage of it back then, and had a Gold card for a year.
Flying Blue is a generous FF program, especially to people based outside France, but you'll have to start back at Ivory.
Upvote:1
Your silver medallion status is good for a year. You can use it even if you are directing points to Flying Blue. If you think you will qualify again for 2018, then continue saving pounts with Delta so you have enough for 2018 status. Then start directing points to Flying Blue in January.
Do you have a Delta AMEX? Depending on which card if you charge a certain amount, Delta waives the MQD requirement.