I got Rubix duel as LTF. I was not getting any upgrades on iOS, changed the sim to android and VOLA got the LTF offer and took it. Same happned with Coral LTF Rupay.
You can apply from a new number, you can read my experience from below thread:
https://www.technofino.in/community/threads/my-experience-of-closing-idfc-select-card-and-applying-for-wealth-card-a-big-fail.22171/post-503734
You can pick up some Vistara card only if Vistara connectivity is available in ur city. Also please note availability is an issue now a days. Atlas is a good choice if you plan your spend as the milestones will be for the card year and not calendar year. If you get HDFC Infinia or DCB nothing...