Thanks for this idea about the checkbox. We will make a note of it and have a think. Yes swiping to the right is iOS only.

Another alternative might be to put the 150 songs into a playlist email it to yourself, Clear your iReal b data (in Android settings>apps>iReal b) then re-import them from the email. (If you are not familiar with emailing playlists, run some tests first to make sure you do not lose your playlist songs.) Unfortunately you will get the exercise songs that come with iReal b, but you can Search for the word 'exercise' and delete them as you are used to doing.
(Android devices can usually only import a playlist with about 300 or less songs, so if you have to do this in the future, make sure you have <300 song playlists.)

Some of the playlists now list the individual songs so if you only need a few, you can just import that ones you want rather than the complete playlist.