As I said, I haven't tried yet to search on this subject of Chan lay practice. But what immediately popped up in my mind was this teaching from the Platform Sutra (ch. 3):
The master said, “Good friends, if you wish to cultivate this practice, you may do so either as a householder or in a monastery. Householders who are able to practice this are like those persons of the East whose minds [harbor] good. Those in the monastery who do not cultivate it are like those people of the West whose minds [harbor] evil. It is only that the mind should be pure—then it is the Western [Paradise] of the self-nature!”
Lord Wei asked further, “How can householders cultivate this practice? I hope you will teach us this.” The master said, “I will recite a formless verse for this great assembly. Just cultivate according to this, doing exactly as if you were always with me. If you do not cultivate according to this, what benefit would it be to take the tonsure and leave home [to become a monk]?”
The verse goes:
With the mind universally [the same], why labor to maintain the precepts?
With practice direct, what use is it to cultivate dhyāna?
Gratitude is to be filial in supporting one’s parents
Righteousness is to have sympathy for those above and below.
Self-subordination is to honor the lowly and the familiar.
Forbearance is not to approve of the various evils.
If one is able to rub sticks to create a fire,
The red lotus blossom will certainly grow from the mud.
That which causes the mouth suffering is good medicine.
That which offends the ears is loyal speech.
By reforming transgressions one will necessarily generate wisdom.
To defend shortcomings within one’s mind is not wise.
In one’s daily actions one must always practice the dissemination of benefit [for others].
Accomplishing enlightenment does not depend on donating money.
Bodhi should only be sought for in the mind.
Why belabor seeking for the mysterious externally?
If you hear this explanation and practice accordingly,
The Western [Paradise] is right in front of you.
The master said further, “Good friends, you should all practice according to this verse. See your own natures and directly accomplish the enlightenment of buddhahood!
"While teachers of the middle way, mind only, transcendent wisdom, mantra, and other schools may have their own assertions, the fulfillment of those intentions is the same. There is not a single thing that is not contained within mind."
(Gampopa to Düsum Khyenpa, in "The First Karmapa", KTD Pub, p254)
“If you recognize the world of appearance and existence as the mind, realize the mind itself as empty, and have no grasping at the superiority of your realizations — this is the ultimate view."
(Chegom Dzongpa, in "The Book of Kadam", Wisdom Pub, p609)