Been able to get .218 on the 15010 (Worldwide) firmware, quick tutorial:
1. Install 15010 firmware if you have x150e and haven't installed it already.
2. Install Insider app and choose fast ring, once enrolled check for updates and update the phone (this should get you to the 10586.107).
3. Once updated quickly before it checks for updates navigate to the insider app again and switch to the production ring.
4. Check for updates, this should get you to the .218 on production ring using 15010 firmware. (Or supposedly to the .242 after 10th May)
NOTE: if it did check for updates once .107 got installed and started downloading RS builds then perform a hard reset (settings->system->about) and simply proceed with step 4.
Credit goes to abhijit pore for telling that in the fast ring using 15010 firmware it gets to the 10586.107 before going to RS.