Blindfold option in tactics trainer

Is it possible to add a blindfold option with separate rating for the tactics trainer?

Should not be too much programming since the basics can be taken from the regular one. What I imagine (no pun intended) is similar exercises as the ones in regular trainer, but where black and white pieces are listed with algebraic notation and you must write in the correct move. The board and pieces are then revealed with your move, correct/wrong etc. and ofc the correct solution can be viewed. 

The complexity of the exercises must be lower for most players I guess, maybe most players will have enough with a couple of pieces and only one move to start with.

So at a very limited level, you would have something like:

White rook on a1, king on f6

Black king on f8

What is white's best move?

I can't imagine it would be very popular with more than four of five pieces on the board.

I don't see the problem with that, it is meant as a tool for visualization improvement. This is not anything most people would choose for easy fun anyway as it is quite exhausting to train this way when you are not good at it.

Also, there is a lot of strong players here that will probably manage very well with plenty of pieces and multiple moves.