I use a combination of your suggestions. I use bookmarks in the same manner that rhadin described. Also from the home screen, you could select Books > See All. I then have that Books list sorted by Latest Read. It makes the books you are currently reading at the top of the list. Lastly, I have been using goaspy's tool in the Sticky threads to make the 3 books on my home screen my "currently reading" books as Pinecone suggested.
https://www.mobileread.com/forums/sho...d.php?t=107826