Is there any evidence that says mixing RPG, MUD, text-based and graphical clients is a bad idea?

[Gerben]

Is there any research of proof on mixing two types of games.

To be clear; I want to make a "text"-based RPG, but also allow the player to walk through the map and have battles. (For this I'm probably going to use Phaser)

So traversing and battling would be done in the (lets call it) client, but actual exploration would be done on a page with a hint of MUD.

I want to allow players to set up their own shops, you can walk to these shops in the client. But buying and for the owner, setting everything up, is done on a page.

The reason for this is that I want the game to be more like interactive fiction, but considering my programming background, go overboard on the interactivity.

To summarize;
Is there any evidence that says mixing RPG, MUD, text-based and graphical clients is a bad idea?

Subjective bonus question: What do you think of mixing these elements?