In an E/AB you could get a DPE to agree, but for experimental EXHIBITION there is no regulatory path to use it for training, rental, or certification.
Ninja edit:
C. Experimental Aircraft. An applicant may request a
practical test in an experimental aircraft.
The aircraft may
be certificated as amateur-built or for exhibition purposes.
An examiner may conduct a practical test in such
experimental aircraft provided that all the following
conditions are met:
But I still have doubts:
Experimental airworthiness certificates may be issued for the following purposes:
- Research and development: to conduct aircraft operations as a matter of research or to determine if an idea warrants further development. Typical uses for this certificate include new equipment installations, operating techniques, or new uses for aircraft.
Exhibition: to exhibit an aircraft’s flight capabilities, performance, or unusual characteristics for air shows, motion pictures, television, and similar productions, and for the maintenance of exhibition flight proficiency.
When do you get out of the R&D phase and into the Exhibition? Also none of them allow for flight training other than required crew members.
Did you get flight training amended to the restrictions/limitations?
Granted unless the FSDO cares its most likely not a big deal, but I wouldn't put my checkride validity on it.