Hi,
I just "tripped" over your post since I had a similar problem quite a while ago. Maybe (surely) to late now for your post, but just in case other would have the same the problem again in the future:
For the I2C Scanner you "just" need to put the MPU6050 in pass through mode and you will get all 3 addresses.
See attachment for a slightly modified/enriched I2C Scanner for MPU6050 + other sensor boards.
Hope that may help others and all the best
Tim
I2C_Scanner.zip