Yamato transport (kuronekoyamato.co.jp) do takkyubin (Ta-Q-Bin) which is luggage transfer from airport to your door or visa-versa. Cost about $25 a bag to go from Niseko to Osaka so from Chitose to Niseko should be much cheaper.
They held my luggage in Osaka for two weeks, I sent it from Niseko then went travelling, picked it up at Kansai a couple of hours before my flight home.
Not sure if it'll suit your needs but have a look, might be able to get the two services to work together.