I'm amazing you stopped using the swaddle if baby wasn't rolling. You could have had 7 blissful easy months using the swaddle easily until baby starts rolling.
It's normally learning to roll that is the trigger for starting to think about stopping the swaddle, rather than first starting it again!
The safety first - it's dangerous to start using a swaddle on a baby over 3 months old of if they weren't used to the swaddle under 3 months old. I'm not sure on how restarting swaddle use would fit into this, but thought I would mention it.
I would also say that at 7 months I would be concerned about hip development. So if swaddling, I'd leave legs freer to move. This is easily done by swaddling with a giant muslin or cot sheet - these hold baby around shoulders and you can leave legs unrestricted.
Regarding using the swaddle when baby can roll, there is nothing in any of the SIDS or NHS recommendations that says you must stop by X-point. Nothing says you must stop when the baby rolls.
The concern would be if baby rolls into front, doesn't have the neck muscles to lift head and shout so suffocates.
So breaking that down. In order to roll, babies usually swing their legs in order to create momentum to get over. In a swaddle this is much more difficult. Meaning of baby managed, he has fairly strong muscles to manage it with restricted movement.
So if baby does her get onto his front, and given he is now an older baby, logic would say that even if face-first into thr mattress that he could lift his head and cry to get your attention. Be sure the mattress is firm with no pillows, loose covers or cuddly toys in the way, just to be absolutely sure nothing could get in the way of him breathing if he does roll.
Of course there will never be zero risk, but you and DH can choose to manage the risks as you see fit.
Although a different age, I swaddled throygh my daughter learning to roll and for a good couple of months afterwards.
I'm still amazing you dropped such a useful and easy settling tool way before you needed to. Swaddling before baby can roll over is the best thing ever for helping baby sleep.