In general, I am a fan of
props in yin, provided they are used to create the appropriate amount of stress in the appropriate areas. By appropriate amount, I mean that the props can reduce stress when it is too much and prevents a student from lingering longer in the postures; or props can increase stress when the stress is too little and nothing is happening. By appropriate areas, I mean is the stress occurring in the targeted areas? If the answers are yes, then by all means use the yoga wheel. But, if using the wheel creates too much stress or the stress is not going where you want it to go, stop using it.
You use the word "exhilarating" ... which is not normally a term I hear from yin yoga students
Is this really a yin stress you are creating? Or just another short-held, yang backbend/heart opener? Can you linger there for 3 to 5 minutes without overdoing it? If so, great!
Cheers!
Bernie