Definitely looking at the O1's. I have a school across the street that has a newly paved back lot that is always empty. I know from experience that my back kills me after any time off ice, not to mention how the legs feel. From reading the reviews I think if I'm investing that much in an off-ice skate it's worth also getting some roller hockey knee and elbow pads since hitting the pavement is likely while getting used to them.
At the start of the pandemic I made this move to solo roller hockey at the abandoned tennis court, some of which I documented in this thread. My two, mostly obvious, cents:
1. Buy a $12 'mylec' plastic blade and put it on an old stick because whatever you submit to the asphalt is going to get trashed.
2. I took to wearing kneepads (just construction style), leather gloves and elbow pads. The leather gloves and knee pads were vital because I took some skin off without them and then the hard plastic on the knee pad helped me slide through a couple falls where I otherwise would have lost skin.
3. I got some bauer inline skates that were in essentially the same boot as my skates. I was happy with that and the price point was not near the Marsblades which seem like they are really for competition? IDK? If you are just trying to get back in skating shape, you might save a few bucks there, and get the same boot as whatever you use on the ice.
4. I moved through all sorts of puck options and settled on something called the "proguard" which is a slightly bevelled puck with sort of 8 raised half circles on each side. It tended to respond pretty close to the response of a real puck and was not too bad in terms of bounce or roll. I was briefly hot on the heavy, small stick handling balls but they break and are so small that they go through chain linked fence. One good shot into anything hard and it is gone. (edit: 4a. playing with a regular street hockey ball or anything else sucks because they are all too bouncy and too light. I briefly used a field hockey ball in desperation, but it was a bit much).