Excellent question but not a problem. Run the "digital out" from the DVD to the Receiver and the "analog outs" to the Creek, presumably as they are now.
Dolby Digital and DTS are transferred from the DVD player to the decoder (which is integrated into the Receiver) via a single digital cable. Usually a RCA type connector, but some use an optical type as well. If you decide on this interim solution, make sure the Receiver selected can accept your DVDs available output. Most Receivers and DVDs can accept/output both but not all.
The Receiver will decode that digital signal from the DVD and pass the front L/R, via the preouts, on to the Creek and simultaneously feed its (receivers) internal amplifier with the center and surrounds.
This setup is very acceptable if your goal is good 2 channel sound. As a matter of fact, your 2 channel sound will NOT be compromised in any way.
I would like to stress that I am not recomending this setup over another. It is simply an alternative. Especially taking into consideration your priority (2 channel), that you presumably like your current sound, and only need to add HT.
Conversely, you can get very good 2 channel sound from an HT processor but it will cost....Money, system flexibility, and increased complexity. Not just the processor, but also an amplifier/s, powercords all around, a wad of interconnects, etc., etc. Just some things to ponder as you decide the future of your system. If you're like me, its no worries, I love this stuff.