What exactly is not a "tall order" about asking a jazz beginner to learn 25 charts, that they don't know how to read, with no theory knowledge? I think 8-10 is far more reasonable for someone first dipping their toe in it. 25 songs for the level the OP describes is a HUGE ask. Learning some parts off videos by rote repetition is not going to do much to advance him as a player in the bigger picture, and familiarity with the material is a lot easier if you aren't asking him to learn 2 dozen tunes at once.
You don't need to memorize the songs, and the bassist doesn't need to read the melody, just the chord changes. If a bassist can play 8-10 standards from lead sheets, they can play 25 with not much more effort. The hard part is learning how to play from a lead sheet, and you learn that with the first song. Everything else is familiarizing yourself with the new song and looking for potentially tricky passages.