i have tried Chinese search engines, but did not find much. i tried Jau Lung plus Ching Wa in Chinese characters, but nothing.
one text mentions some Ching Wa (in simplified Chinese 程华) in relation to martial arts:
http://www.gzsdfz.org.cn/gzsz/16/ty/sz16ty010101.htm
this part:
武术团体
清代，广州已有武馆出现，民国时期，武馆有所发展，武馆开设的目的多种多样，武术活动遍及各阶层、各行业。至建国前夕，广州武馆约有二三百家，均以团体会员加入广州市国术协会。
私人武馆较有名气的有林耀桂、张礼泉、邓龙、邓锦涛、廖恒、陈斗、李尧山、谭三、伦枝、利锦、崔章、潘荻、洪胜馆(初由李恩，后由黄啸侠负责)、林世荣、程华、孔玉峰、陈耀墀、陈培、方玉书、吴肇忠、陆智夫、邓芬、黄杏泉、黄昌、叶兆文、陈汉雄、周癹、谭坤山、刘湛、邱全、“全义堂”(武术教练区汉泉，醒狮教练刘伟雄)等馆。还有芳村林少立、汤锡，河南有帅祖，泮塘有颜耀庭，源溪有谢蛇，小桥有严三，西村有戚光、戚松，南岸澳口有蔡伯达，三元里有梁添，小北角有吴少泉等武馆。
but it just mentions his name (after Lam Saiwing, so the time is more or less same as Jau Lung's)
i have sent an e-mail to a WCH friend of mine, if he finds out something, he will let us know
PS: from the other forum - if you ever come to Prague, it will be an honor for me and my school - you will be my guest and i can be your guide. i can also organise a small seminar for you here, if you like - Hung Jau Yat Ga, right?
all the best