Really? You can't grab a warp and/or retrace scroll before you get a warp from the VW NPC's in town? Or get a tele/warp/recall from the mages (books/OP/NPC's are very close to some)? And inventory clutter...are you serious? A ring to get you to an OP. One ring to Recall you close to Campaign NPC (chocobo's at the crystal). One Warp Cudgle. Take your pick. You could manage this with just one or two slots.

the point is... it is not hard to get around Vanadiel if you just think about it for a minute.