If your existing wheels are not tubeless-compatible, Muc-Off sell sealant intended for use in inner tubes rather than tubeless. According to this review (https://road.cc/content/review/muc-inner-tube-sealant-277333), it works as advertised, and should seal punctures caused by goat heads. If you're using presta valves (which it looks like from your photo), you'll need tubes with a removable valve core, to allow you to get the sealant into the tube.
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