Adding internal memory slot in a famiclone/fake NES/NES Clone?

I've a NES clone (NS-81) which hasn't games in internal memory. The console hasn't the 60 pin internal connector, at the bottom of the motherboard, where some famiclones have inserted an internal card.


I have one of these cards from an old NES clone (left image).
I would ask you if is possible to add that 60 pin slot and improving the console allowing you play with or without an inserted cartridge.

I know that exists 60 to 72 pin adaptors with which you can use the internal memory as a Famicom cartridge but it isn't my idea. In fact, I've bought one like this:



Do you think any idea? What will happen if i solder the conversor to their respective pins at the botton of the motherboard? In this case, and expecting that it worked, what will happen if I insert a cartridge in the 72 pin slot? Should I use a transistor as an interruptor in order to avoid conflicts?or it's more simple?

 

You have to ask "cluster" I think. Just search "cluster on youtube" and you'll find him.