Thank you. Looks like what I have in mind is called a Gyrodyne[1] or Heliplane[2]. I would expect it would have almost the same range and speed as an airplane with VTOL capabilities. As you mentioned, the interaction between the two flight surfaces may be too inefficient, but the X3 you linked to broke the unofficial speed record, so there's that.

[1] https://en.wikipedia.org/wiki/Gyrodyne

[2] https://en.wikipedia.org/wiki/GBA-DARPA_Heliplane