Hello and welcome.
I cannot even begin to think about the logistics of 2! I found one to be a handful
But just in case it helps -- at 9 months, we were doing around 4 hours awake time between naps with 1 long nap of 2+ hours and a catnap of 30 minutes. Average A time at this age is 3-4 hours, so that looks good in your routine. If you find the naps are not lengthening, you could experiment with increasing the time slowly to see if it helps. What you could do, is pick one nap -- whichever one is easier and work on extending it ( Again, I have no clue about how that is done with 2) and you could keep the second nap as it is, a catnap.
We also swaddled for a long time - we weaned at 8 months, so I totally get the appeal. I was apprehensive about weaning but it was just quicker and smoother than I expected. Nights were fine from Day 1. She simply flipped over and slept on her tummy from then on. For naps, we put a folded sheet over her and tightly tucked it on both sides of the crib. This helped her fall asleep as her hands were flailing around wildly otherwise. During the nap, her hands would escape but she got used to it. Here's a link about weaning the swaddle
https://babywhispererforums.com/index.php?topic=251444.0 I do think weaning the swaddle might help your night wakings. All the best! Xx
PS- I found this chat thread for twins and multiples. I don't know if anyone is still chatting but might be worth a read to see how others have got on
https://babywhispererforums.com/index.php?topic=267157.330