Yea, you can try putting your reference sample in a capillary tube and seal the tube. Then put that in your NMR tube. The only issue may be that sometimes the high spinning can cause the tube to either: not spin evenly, or if it bangs around, it could break.
Otherwise, you can get a special coaxial NMR tube like these
. They're very handy. We have our compounds in water (we observe the effects of the magnetic compounds on the water peak), and then we put D2O in the inner tube so we can lock the signal on the D2O solvent.