SFF to Trade Merge, will I keep my Atlas Progression?

I am 114/115 on the Atlas and the league ends in a week, I stopped playing this league all together a couple weeks ago and I would like to buy the last unique map I need to complete the Atlas because I purchased the Premium Kirac Pass so I would like to get the last reward.

The only problem I have is that I have been told if I migrate from SSF to Trade I will lose all of my Atlas progression which is the last thing I want, if there is no other way I will have to farm for the last map but I would really like to just buy it and not worry about it.

So my question is, is there any way to migrate to trade and keep my Atlas progressions so that I can buy the last map I need and collect my last premium reward?

Use the League Migration button on the character selection screen, it looks like >>

All of your progress, items and characters will be migrated over.