Since we have only seen reentry form the a capsule or from far away i suggest a idea to see it up close. Send 2 Cubesats with heat shields and and have one with a camera. Have one Cubesat go in front of the second Cubesat Then point towards the other Cubesat during reentry. You could put the camera in a strong box with a parachute. (P.S I know nothing about reentry so sorry if i'm wrong)