I'm pretty sure driving up the road as far as possible, and then walking up the road past the gate(s) would be much easier than anything else. There is a hard closure gate at the lower gated point, so it's a 3.5 mile walk just to the trail head.
There is an old trail from the Portal Store up to the North Fork Lone Pine Creek crossing, but I doubt it would save any time in winter. There are always a few hardy climbers going this time of year. Most go up the Mountaineers Route, since the route is shorter. In fact, that route might have a better track from hikers before you.
I have seen a report that there is 5 feet of snow at the Portal. Fortunately this time of year, it is becoming consolidated, so you won't sink in too much.
When you go, please take pictures so others here can see the conditions. Thanks, and good luck!
