psychometric,
without wisdom or experience (I'm not even a guy) I'll say MR Linac is worth the trip. It's a five day treatment 40gy per fraction with a closer margin than Cyberknife. And my inexperienced opinion says that your tumor is appropriate. https://www.mdanderson.org/research/departments-labs-institutes/programs-centers/image-guided-cancer-therapy-program/resources.html