Curious...
You mention Greenhouse, do you have one ???
You mentioned "if your job takes you there" so what is your job ???
IMO you should try Seedlings and/or Pre-Bonsai in Juniper...Green Mound, Nana, Procumbens...
Leave them outside watch them grow...Light Style once a year or as Growth indicates...
If really interested in Bonsai, drive over to Flower Market just this side of Monroe, MI. And talk with Kurt Smith owner manager, Easily Best Bonsai shop in the MidWest....also on the Internet, type in Flower Market Bonsai.......