The stem adapter will work to hold it together if pushed down all the way. The beat way to do this is to slightly overtighten the headset and locknut, push the stem adaper down all the way & tighten, then back the locknut against the adapter to take out the slack and correct the headset adjustment. If you can't loosen the headset enough this way, loosen the adapter a bit, then use the locknut to jack it up a hair.
Done this way, it should all hold together fine until you find a new fork.
BTW- this won't in any way be dangerous, the worst thing that will happen is that the headset loosens, and it's a PIA to adjust it this way.
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