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That was my strategy for the Discover IT, though for slightly different reasons. Started building credit 1.5 years ago. Applied for the Discover IT in May '16, denied for limited credit. Opened a Cap1 account same month, but not until I had accumulated 3 HPs (Discover=Nope, Chase=Nope, Cap1=Yep). April 17', 11 months later, I decided that I would just go the Discover secured route to get in the door and not fart around with applying/being denied again/having to call recon. Had my card unsecure less than a week ago, check in the mail, and I now have a $4K limit.
Should confirm deposit soon and the wheels will begin turning. Good luck on unsecuring!
Can you add funds to the secured card after acceptance?