https://www.mmo-champion.com/threads...s-Concept-2022
You utilize Alexstraza as the class' base (Dragon transformation via ability usage) and you base her spec on healing, you base the Chromie spec on RDPS, and you base the Deathwing spec on Tanking. You use the 30+ abilities and passives those characters possess in HotS as your class guideline.
HotS is free to play if you have Battlenet. I would recommend you download it and give Alexstraza a try. It's a very good character, and forms a very good foundation for a dragon class in WoW.
Your character can change their flights because they're a Chromatic dragon, which can imitate the abilities of any flight. I limited the spec selection to three, because only the Red, Black, and Bronze were represented in HotS, and Blue and Green are close thematically to Mages and Druids, and are essentially their dragonsworn.
Tinker is still a possibility. Perhaps Gazlowe is on the cover instead of Alexstraza? However, I have a feeling that Blizzard would make a class based on Alexstraza partially because she's a female hero, and with all of Blizzard's bad PR, creating a new class based on a major female character would score them some PR points.