limited locals with similar bottle count should get it done. deGarde side should probably add a few shelfies to close the $4$ gap since there's not too many $9 sours out there.
With the anniversary party releases (Vin Bu's, Imp Bu's, Desays), I landed a CC '12 and some Cantillon bottles (Iris, St Lam, FF, LPG, LPK). With the most recent releases, I have this trade lined up: 5 new bu's (Peach, Cherry, Boysenberry, Blackberry, Raspberry) for LPG, St Lam, Belgian Flag Geueze x2. I'm adding some local stuff to make up some of the $4$ difference.
Thanks for the detailed info. I saw your original post and was going to offer something like LPG and St. Lam, but didn't have a feel for how the De Garde traded so I got gun shy.