The first issue you'll have is the 14t 1st position sprocket. 1st position sprockets are different from the rest as they must have the spacer built on. This allows the sprocket to overhang the end of the freehub body so the lockring can compress the cassette without bottoming out. If you try to use a loose spacer and mid position sprocket on the outer end, the sprocket will either hang in space, or be hanging by a hair and tear loose under torque.
I don't believe anyone is currently offering 14t 1st position sprockets, but I'm not certain either way so you should check that first before moving forward.
One alternative to using a 14-34 cassette is to go with chainrings about 15% smaller. This will yield similar gearing using a more readily 12-28 or 13-28 cassette.
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