Forster is your best bet, easy to find, plowed parking lots, warm up cabin.
Head west of Radium at the 4 way stop, dogleg lake staging area is the easiest to get to but it's a few more km ride.
Roads are going to get soft in a hurry(bring chains), temps are +5ish these days in the valley.
How many miles of trail before you can find areas to play in? Would Toby Creek be shorter to get into? Im by myself, would like to tag along with some other riders.
It's 40ish km to the cabin. If your on your own Paradise basin is a good option. It's 17km from Invermere on Toby Creek rd(Just before Panorama)
Trail is 16km to the basin and groomed regularly.