I thought of this a few months ago. What if you write something on your hand(s). Something like a text or a sign and do a reality check on that. It actually almost worked once when I had a dream. I used to dream alot about ice slides on the ground(it was winter). I kept doing reality checks when I seen one. And one time when dreaming, there was an ice slide and i’ve looked at my hand. It didn’t worked because i guess i’ve just peaked a look but not rea;ly interesed in what really was there.
That’s it. 
I have also considered sending a text message to myself on my phone. hopefully you would then dream about getting that text message.
Writing something on your hand, a letter maybe, and then doing reality checks when seeing it in your dream would be a great idea. Maybe before you sleep, try to make up your mind that you’ll see the same letter or sign in you dream.
It might work, but what’s the point?
I mean, you can do the hand RC, without a letter on your hands.
And maybe there won’t be any letters in the dream.
or you might not be able to read them
What about combining RCs? Like the hand RC and a sensory one like pinching yourself? Sorry if this is a daft question I am new.
What if some self disiplance… Write something like “Are you dreaming” in permanent ink on something that you treasure… or a common Dream sign.
If it was on something precious you wouldnt be able to stop thinking about it… Hopefully you might then see it in the dream. Sort of the same as if written on a dream sign.
All just hypothetical ideas… I might try them though, hehe.