Should I secondary this Irish Car Bomb, or just flavor in bottle?

[Mechphisto]

So I put together this recipe (my very first non-pre-made kit!!), and what sources I was looking at, there's a flavoring in the secondary stage.

But I decided to use vanilla extract instead of beans, and oak essence instead of whiskey soaked oak (as I'm hoping to bottle before March 15th!). So, I'm looking at this now and wondering if doing a secondary is even necessary, or if I can just add the flavor items to the bottling bucket and then just leave it sitting in bottles for 3 weeks?

Here's my recipe; I'm thinking if any reason why I might still want to secondary, it might be so that the chocolate nibs do affect the priming as much?

10.24 oz Caramel Malt - Crystal 80L (Great Western)
8.4 oz Black Patent Malt
4.1 oz British Roasted Barley
4.1 oz British Malted Oats
3.3 lbs Dark Liquid Malt Extract (LME)
1 oz Northern Brewer
1 oz Fuggles (4.50%)
3.3 lbs Dark Liquid Malt Extract (LME)
1 lbs Lactose
.5 lbs Corn Sugar (glucose)
1 pkg ClarityFerm
1 pkg Safale US-05

SECONDARY (2 weeks)
2 oz Pure Vanilla Extract
2 oz Liquid Oak Essence
1.5 oz "Cocoa Nibs"

BOTTLING (1 - 1.5 weeks)
4 oz Corn sugar (measure by weight, not volume)
3 cup Jameson Whiskey