the lbk is vented by the lid so there is no back pressure.. you will have a layer of co2 resting on top of the beer. stirring gently will disturb the co2 layer a bit but if it wasnt quite done fermenting, more co2 will blanket the top as it picks up fermentation again.
be advised that if you never had a saison you will likely be in for a totally new experience. my first was like wow... this is freaky. it had a yeasty funk, pear, apple, perfume, floral and more funk. it was really different from your typical beer.
for the lbk i would go with dry yeast belle saison. pitch slightly warm. put the fermenter in an igloo cooler without any additional heat for a day at ambient room temp. let it get started. after a day toss a couple hot water bottles into the cooler and close the lid. watch the temps and try to keep them around 74f-76f ambient. let it ferment at about 74ish for 2 weeks. on week 3 move the cooler to a place where the ambient temp hits about 80f if you want and let it go. at the end of week 3 i would be shocked if your fg was not 1.01 or lower. usually i get about 1.006
by bumping up the temp in the last week you encourage the yeast to finish up and clean house. every time i use it, the fermentation is slow and steady. this yeast is typically a dainty eater... not a lot of krausen. not very violent. . . and it has always consumed practically everything one can throw at it sugar-wise.
i use 5 gallon buckets to ferment. for me i can put the bucket in a plastic clothes hamper and fill it with enough water to almost reach the wort level. i then drop in an aquarium heater. after a day at ambient i fire up the heater on a timer... so many hours on... some time off... cycle repeatedly.. and my temps get up to 72-76f. i use a timer to save electricity.
dont give up on saisons.. just try another yeast. even if this batch comes out 'weird' you can still drink it .. just add a tablespoon of Tang Orange powder to your glass when you go to drink it. :) that's what i did with my really awful pumpkin weis when i first got started brewing. i refuse to waste alcohol. yeah it sounds bad but...