Hi
Why dont you just use BIAB with lyrics and export a video? I export my songs as a video and then use VLC on my iPad to play the video. Just be aware that BIAB video export creates a very big file so I usually convert to mp4 before uploading to my iPad. I have loads of ready made backing tracks here https://band-in-a-box-files.com/

[vide:youtube]He Aint Heavy He's My Brother: A Fun and Easy Band-in-a-Box play along with chords anf lyrics
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LyricLab – Where words become music https://www.lyriclab.net/