winter potting

Is this something that could be okay on a tree kept indoors in winter? It's wintered inside until spring. Zone 7. Its a fairly large overgrown tree. Should I just wait for spring? I'm wanting to whip this thing back into some kind of decent shape. One section has close together, uniform leaves...

Got this pretty baby as present, Arbutus Unedo Atlantica, aka small strawberry tree. Love the curve at the base and the bark will be red when aged. Anybody have experience with them? I'm in South Ireland, so warm ish winters with very rare dipping to minus 2 or 3 Celsius. I was going to put it...