Hi there we opted for capsule for baby no 3 and while it is handy its really heavy we got the Sns unity not a great safety rating though also o still need to get dd through the straps you mention I'd I use it like a carseat. She is 7 months now and on the top straps it goes up to 12 kg.

Re prams we had a Phil and Tess I hate it fir reasons you mention newborn and toddler positioning, so we bought the bjcm double and it's great light turns with one hand fits through all doors I recommend it