Hi Ginger,

You can use the DT colourless on the neck. FW is right that the final coat will be too soft.
If you want a more laquer type finish use tru oil instead of the final DT colourless coats (my preference).
If you want a non-gloss finish then gently sand the DT back to 1500 or 2000 grits and leave it blank for hand oils or use DT wax (some like that.

Its your pref.