First draft of a Secret Paladin list:
2x Never Surrender!
2x Noble Sacrifice
2x Oh My Yogg!
2x Secret Keeper
2x Tour Guide
2x Air Raid
2x Hand of A’dal
2x Manafeeder Panthera
2x Mysterious Blade
2x Sunreaver Spy
2x Voracious Reader
2x Goody Two-Shields
2x Inconspicuous Rider
2x Knife Vendor
1x Libram of Justice
1x Hammer of the Naaru
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Between Voracious Reader, Manafeeder Panthera, Hand of A’dal and the deck thinning of Inconspicious Rider, this list seems like it should churn through the deck fairly quickly, which can help negate the downside of having to put paladin secrets in the deck.
Hammer of the Naaru might be ambitious, but I look at it as a slightly more expensive Truesilver Champion that comes with a 6/6. Knife Vendor is another option that might be a bit of a risk, but it does give some damage that can go over the top of things with taunt.
Some cards to consider and potentially swap in: Righteous Cause, Subdue, Silverhand Recruit package (Day at the Faire, Carnival Barker, Lothraxxion, Balloon Vendor), Blessing of Might/Kings/Authority.