WillowRun 6-3:
NASA has a DC-8 airborne science laboratory that could be configured to do just that. Approach some science types, maybe through Univ of North Dakota National Suborbital Education and Research Center (NSERC). You never know what might become of it.
DC-8 | NASA Airborne Science Program
The airplane is presently flying the SEAC4RS program out of Houston (KEFD) until Oct 1, in case you're in the area.