Right now, snow and road closures will add mileage and hours to most trailheads. Split is a bitch of a dayhike any time of year, but the drive might not be any worse now than it would be in August. No matter what you attempt, be sure to start early enough to get up high before the snow turns to slop. Several SPS peaks are within striking distance of Onion Valley IF you can park near the TH.