Have there been reform movements in 20th century Korean Buddhism that put more emphasis on meditation practice than traditional Korean Buddhism did, and that, in particular, also encouraged meditation by lay people? Put differently, I wonder whether Korean Buddhism has had a reform movement similar to, say, the reform movement of Mahasi Saydaw in Burma (that, in turn, was important to the development of Vipassana meditation as practiced by many in the US).
According to the answer to a related question, there was no significant reform movement in Korean Seon:
So there may be others who revitalized Seon, but in many ways the traditional practices and texts of Seon remained unchanged over a long time. Of all 3 Seon, Zen and Chan, the Korean practice seems the most like a mono culture with a tendency to remaining close to traditions.