Tips to Stop Swaddling

How did you stop swaddling? I have a feeling my little one (11 weeks) will be rolling in no time. We started swaddling her with one arm out during naps. She will sleep.for about 40 minutes before startling herself awake. We have tried doing the same at night but waking every 40ish minutes was too much for us and she was so exhausted. I've even tried going cold turkey during a nap and she was instantly awake. She loves being swaddled so I feel like it's going to be a difficult transition.

I am not interested in the Merlin's Magic Sleep Suit. I worry she would overheat and can't justify paying $40 for her to only use it a couple weeks.