coral,
I read that squatting for delivery is fast because of gravity. But I believe it needs a lot of energy from mother. Hence, if you are consider this way to delivery, you need to tone up the thighs muscles. I know in western countries, the gyneas/midwives encourage all kinds of way to delivery, at mother's comfort. Din really hear of other ways to deliver is SG. Perhaps you can talk to your gynae. Believe they will allow.
I did a lot of squatting during my first pregnancy, not delivery. 1stly, my mum's place toilet is those squat type. 2ndly, I have a platform bed (so I need to squat whenever I go to bed or wake up). 3rdly, my warerobe is those 2 levels type, my clothings are hanged at the lower level, so I have to squat to take my clothings. My delivery is those "normal" way. Lie on bed, open leg wide wide and support from the bed. The midwife helped me spread open the leg till very wide and she put my leg to the support on the bed (dunno how to describe but like a hook like that). I was very surprised how come can open till so wide!!! (Does it sound gross to describe here????)