Your question leaves me scratching my head wondering WHY you want a zipper? I have a mummy-shaped silk liner made by Cocoon that is inside my REI Magma 10 sleeping bag that has no zipper. To MEeee, any liner is merely something to separate MEeee from the interior of my bag. This keeps the interior of my bag clean, the silk liner is easy peasy to pull out & wash if it gets dirty or smelly from body odor.
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The first time out on an overnighter I started setting up camp as it was getting dark, I was at 9,735' just off the Rim to Reno trail. As I set up my tent, thanks to lots of practice in my backyard, I realized the ground was soft humus under a long-standing tree canopy. Fortunately, I had the good sense to gather up heavy rocks while there was still enough light to see & place them on top of all 10 stakes. Shortly AFTER accomplishing that task, Mother Nature starting blowing some strong gusty winds that shortly turned ferocious & lasted for hours. My tent did its job of protecting me from the cold gusty winds. I have no idea what the wind chill was except to say had I been out in the open & exposed to the cold wind I would have experienced hypothermia is short order. I was v-e-r-y happy that the tent didn't flap & sway in the wind. I should add, my Magma 10 Sleeping bag which was on my inflated NeoAir Thermarest XLite - Womens, kept me warm & cozy although I didn't sleep very much because of all the noise the gusty winds were making. Shortly before the sun came up the winds died down & the day turned out to be calm with a nice gentle breeze all morning & afternoon until I reached the Thomas Creek Trailhead. THANK YOU, THANK YOU, THANK YOU, for designing, engineering, & manufacturing two pieces of equipment that were essential to me comfortably getting through the cold gusty windy night.
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