Personally when I have good compost I save it for intensive annual vegetables and my hungry perennials (rhubarb, globe artichokes etc... Why not try planting some nitrogen fixing cover crops in your wood chips, along with a few accumulators?
Woodchips planted with clover and comfrey
should work a treat - the comfrey deep mines for trace minerals and the clover n-fixes. When the time comes to top up the chips just slash it all down to ground level and mulch right over the top.
That said, if you do want to put compost on the spot top dressing on the woodchips is fine. The nutrients will wash on through (although some of the nitrogen will probably be taken up by the chips themselves and be released slowly as they break down).