You CAN keep it in a pot, you CANNOT keep it indoors, you CAN keep it small and IT IS not suitable for bonsai.
Admitted that I had the wrong species in mind, looking at the sample I'd say it is not really that great material for bonsai.
However, considering this is an experienced bonsai grower, growing the tree in its natural environment, vs. a Complete Newb growing it in the wrong climate, I'm still going to say it's not suitable.