Upscaling 720 to 1080 and downscaling 1080 to 720

Hi all...
I'm editing a largely talking-heads documentary. We shot most of the interviews on a DSLR in 1080 24fps. I've been editing in a 720p ProResLT sequence, so that I can take advantage of the "extra" resolution by zooming in to 100% at times. (Also, the DSLR shots aren't the sharpest, so this way the softness is not as obvious.) I plan to master to 720p ProResLT.
The issue however, is that when creating a DCP for some theatrical screenings, this exported 720 master is going to be scaled back up to 1080.
So my question is, which is preferable with 1080 footage when I
a) want to zoom in by 130% for closeups pretty often and
b) when in some cases it will need to be delivered/projected at 1080:
1) Edit in a 720 sequence so that the zoomed-in shots will not be scaled larger than 100%, export a 720p master, but then for the DCP scale that master back up to 1080. So in the DCP, shots that were originally 1080 at full quality, would now be 1080 up-rezed from 720 which was downrezed from the original 1080 footage.
2) Edit in a 1080 sequence, the zoomed in closeup shots will be at 130% and thus not full quality, export the file for the DCP at 1080 from this sequence - and at least the non-zoomed-in shots would be at full quality, ie 100% and not larger. And then for the 720p Master (if there is a point in having one) I would either nest that 1080 sequence into a 720 timeline, or I would import the exported 1080 master file into a 720p timeline. But in the 720 export, the shots that I scaled up to 130% in the 1080 timeline will now have been scaled back down to 100%. I'm not sure if quality is lost going up and down like that, in either option 1 or 2.
Also, is there a difference in quality between screening a 720 film where the projector upscales the image vs upscaling the image before exporting and exporting a 1080 version?
Thanks!

My two cents (worth exactly 2 cents)
Continue editing as you have to take advantage of the reframing ability. I would probably change the final output to ProRes 422, but that is your call.
When complete and you need to deliver a 1080 version, have the uprez done by hardware such as a Teranex:
Blackmagic Design: Teranex Express
MtD

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Upscaling 720 to 1080 and downscaling 1080 to 720

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