The steps to stream entry:
1) association with kalyanamittas/spiritual friends
2) listening to the true dhamma (..said by 1) above)
3) appropriate contemplation (yonisomanasikara)- what you considered 'contemplation', if I am not mistaken
4) practice according to the dhamma. (dhammanudhamma patipada)
In my practice of teaching, I find that yonisomanasikara serves as a good foundation for contemplating anicca etc BEFORE starting bare awareness/choiceless awareness, because otherwise many practitioners will simply go down the 'make samsara comfortable route, by being mindful'. I used to start with mindfulness, but now I make sure that right view is in place, before starting pure satipatthana. This is time well spent, otherwise people could go completely off track.. as seems to have happened sometimes.
I feel the dhammanudhamma patipada refers to the satipatthana- note that silavantan sutta say a practitioner MAY get into stream entry by appropriate contemplation alone, but in the satipatthana sutta this is guaranteed - it is the 'ekayana' path- the one sure path. You ask for other suttas - well Anapanasati sutta, Kayagatasati sutta and the satipatthana samyutta all come to mind. Remember there are 8 other factors to practice as well- so there are lost more suttas on those elements of the path as well- and it is not all about mindfulness (the one-fold path
Also look at this:
"In the same way, there are these gross impurities in a monk intent on heightened mind: misconduct in body, speech, & mind. These the monk — aware & able by nature — abandons, destroys, dispels, wipes out of existence. When he is rid of them, there remain in him the moderate impurities: thoughts of sensuality, ill will, & harmfulness. These he abandons, destroys, dispels, wipes out of existence. When he is rid of them there remain in him the fine impurities: thoughts of his caste, thoughts of his home district
, thoughts related to not wanting to be despised. These he abandons, destroys, dispels, wipes out of existence.http://www.accesstoinsight.org/tipitaka ... .than.html
We should not let ourselves be biased based on the locality from where our teachings originate from.