Can I change managed media to external media in FCP 10.1?

Question

I just upgraded to Mavericks and FCP 10.1.1 and I think both are great software so far.
I am working on a documentary with about 250 GB of HD footage. The footage for the project was all on the same external drive where I am saving the Library, and I thought I chose "Leave files in Place" when I imported to save hard drive space.
I have done a lot of keywording, markers, synchronizing clips, color balance tests, etc. though no real timeline editing at this point.
But I discovered today that the Library is huge: ~270 GB. That suggests I imported the media to be "managed media" rather than external. This means the media is taking up twice as much space on the hard drive as it needs to.
Is there a way to remove the imported media from the Library but keep the pointers to the original media and also keep all the keywords, markers, etc. I have already done? I'd like to switch it to "external" rather than "managed" as if I had chosen that when I imported (which I must not have done). But I don't want a new copy of the media files (see Note #1 below), I just want to point back to the source footage on the same disk.
Notes:
I found info about using "Consolidate" and foolishly tried that. Now the Library in question is reduced to ~45 GB and there is a folder I saved the files to that is ~250 GB. So the external drive now has a 45 GB Library, a 250 GB Consolidated files folder and 250 GB of original footage files.  I still want to get rid of the duplicates of the original media without losing the keywords, etc.
The footage is well backed up elsewhere (2 copies of the raw footage on separate drives).
Thank you!

Answer 1

Thank you, Luis.
I appreciate your advice but am not clear about a few things.
1.
For some of the clips in the Event Browser, "Reveal in Finder" is greyed out. I did some digging in the "Consolidated" folder in the Finder and confirmed that the three I checked just now are, in fact, there in the "Consolidated" folder and should be accessible from the "Reveal in Finder" (but aren't).
2.
There is no "Show Original" option when I select one of the files in the Finder.
[I'm not sure how the symlink works in Mavericks (or other recent OSXs), but when I "Reveal in Finder" from the Events browser, the items in the "Consolidated" folder are listed with the name in black type and the Date Modified, Size, Kind listings in greyed out text.]
3.
The names of the files that are revealed by "Reveal in Finder" have the date of import into FCPX plus the term "(id)" appended:
for example: "2013-11-15 17_02_44 (id).mov"
I changed the names of the clips in the Event Browser since they had all come in with the default date-time format and I wanted to clarify for myself what the files were (there are 428 files at this point). So that name probably matches what it was originally imported as.
4.
The footage is stored on the hard drive as the raw format recorded by the cameras (a Canon and a Sony). So the original footage is in typically byzantine folder structure.
For the Sony footage it's:
XDCam Raw...>
     BPAV>
          CLPR>
               -03_8354_01>
                    -03_8354_01.MP4
                    -03_8354_01.SMI
                    ... (several other files)
So I'm wondering if FCPX has to import this footage into mangaged media since the source footage is raw.
And I'm uncomfortable deleting the original raw footage (yes it's backed up elsewhere but this is my only local backup).
So I'm back to: Can I save space by changing the currently managed media into external media without duplicating all the media (as I did when I did the "Consolidate" command)?
Or does the raw footage have to be imported and used as managed media since FCPX can't work directly with RAW Sony and Canon footage?