This is what house rules are for. You can move subclass levels around all you want, or make custom backgrounds that are essentially the subclass you want so that you can get your "subclass" at level 1, or just do feature exchanges if a player just wants one specific class feature from a different class and you can swap it in for another one you swap out.
WotC doesn't need to write the game exactly the way you want it to go... considering every single one of you wants it to be something different and thus it's actually impossible to give each of you exactly what you want.
So since WotC can't give you what you want, you have to give it to yourself. And yes, that might mean needing to talk to your DM and for them to allow it... but if they are going to give you a hard time about it and it really matters that much to you... find a new DM.
WotC doesn't need to write the game exactly the way you want it to go... considering every single one of you wants it to be something different and thus it's actually impossible to give each of you exactly what you want.
So since WotC can't give you what you want, you have to give it to yourself. And yes, that might mean needing to talk to your DM and for them to allow it... but if they are going to give you a hard time about it and it really matters that much to you... find a new DM.