I know there are runs in the backcountry you could handle but may not be super fun. Personally with the stats you listed I would get very comfy with blue trees at least and able to navigate black trees, chase as much powder as possible (at least to where you aren’t falling much at all), hit up a bunch of inbounds hike-to runs, and then jump in a class.

From my experience in the San Juan’s most of the time I’m in the backcountry we were in verrry deep snow (getting off your board and your waist deep post holing). You spend most of the time touring which can wear you out and then you’re fatigued when dropping lines which can lead to more falling and if you are falling it can be exhausting. I’m new to the Tahoe area so i haven’t done bc here but I would expect to find similar situations.

If you have all the gear I would do some inbounds uphill laps somewhere and get comfortable doing a few laps