Yes, adding spacers behind the cassette is a common practice, and there's no negative consequences. Add enough so that the front lip of the cassette overhangs the freehub body so the lockring can compress it without bottoming against the freehub.
However, before buying the new wheel make sure that the overall axle width matches your frame. Or you could spread the frame if necessary.
So there's no serious reason not to buy and adapt these wheels, but IMO you'd probably be better off with wheels that match the bike, unless you're planning for future upgrades.
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