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A pain in what sense? Do you mean if you want hassle-free wheelswaps mid-race and want to duplicate the hub/wheel spacing on the second set? If you're running tubeless set up well this really shouldn't be an issue. You won't need multiple wheelsets for your CX bike, just a selection of tyres. I'm only offering practical-skewed thoughts so happy to quiet down if you have different ideas. It's just I think getting a cx bike with decent clearance and dependable drive chain is all you need to find out whether you have the heart and the legs for CX.
Get a Caadx Tiagra. Comes tubeless ready as well. I would say if you are serious about a season of CX (eg doing all the London X league fixtures) don't go fancy, and don't apex 1x11. When you have to spend 60 on a new derailleur as opposed to 25 once (or maybe twice!) in a season then you'll think twice about whether it was worth it. Not to mention the cost of getting to and from the races, plus cost of entry. CX is great but it's not an #outsideisfree kind of cycling. Then if you love CX you can drop all the money on drive train and tyre selection. Read back through for AndyP's advice, his stuff is evergreen.