You have the AH mount; with that kind of gold to throw around you can easily buy all the gear you need to get good enough ilvl to run mythics without ever entering them.
My second alt dinged 2 days ago and is already 330 without entering a dungeon because I just bought a bunch of BoEs on the AH and did one day of WQs, which pushed my WQ rewards into the 325+ (340 from emissary) range which trivialized the gearing further just through WQs. Spent like 300k gold doing that, which is nothing. I don't have anywhere near the kind of money to throw around that I could consider buying the AH mount either.
If I can do that for my second alt in a couple of days with far less resources invested than you have available to you then you can do the same for your main in however long you've been playing now.
Honestly sounds like you don't want to get into mythics: Your goal isn't to get into mythics, but to convince people that you shouldn't have to because you'd rather just queue to heroics, and actually being able to enter them would undermine your argument. So you go out of your way to sabotage yourself.
An attitude change would solve this problem right up real fast.