ARRIRAW offline editing workflow with AJA Kona 3 and FCP

I'm not sure that this offline workflow has been done before. I'm working on a low-budget feature film that is being shot on the Arriflex D21 at "true" 24fps. I'm using the AJA Kona 3 to import the footage from an S.Two iDock into Final Cut on my Mac Pro tower. Apparently, the only way to import this into Final Cut at 24fps is with 1080spf 24 Apple Pro Res or DVC Pro. I'm using Pro Res now, but the files sizes of the captured footage are still too large, and because the budget of this film is limited, I need to somehow fit the footage onto 4TB of space.

The footage is averaging about 250GB/day, and it's already the 4th day of an 18 day shoot. I have little time to solve this issue.

Basically, I need to know if there is someway to convert/compress/downsize the footage I've captured and still maintain the same timecode. Timecode is key here because when the rough cut goes to post, it's all dependent on the EDL.

I've already tried compressing footage with Quicktime Pro, and when I reconnect the footage the timecode is lost. I spoke with someone from S.Two and someone from AJA, and their answers were get more hard drive space because ARRIRAW was designed to be cut offline in HD and AJA is unable to down convert footage at "true" 24fps. AJA told me their products are mostly used for broadcast, not filmmaking, which is why I only have a 1080spf 24fps capture option.

I spoke with one friend who believes there may be a way to compress the captured footage with Compressor, reconnect the compressed footage with FCP, and maintain timecode, but he didn't know exactly how, and I haven't been able to figure it out. If anyone knows how to compress footage capture at Pro Res 24fps and maintain timecode when reconnected to FCP, you will be my savior!