Instantly would be a stretch, even with the limited selection of DSD titles available for download because of the time it takes to download them but even more of a stretch if you plan to roll your own. There are several threads on this now in quite a few forums (not just AVS) and even we have discussed it here a few times.
The Oppo 103/105 will play them now from HDD and foobar will play them via attached computer.
If you are serious, PM me and I will see if I can get you on the right track. It is a little off topic for here so I will spare others the details.