The evidence shown for the Thổ / Tày language of Lạng Sơn and Cao Bằng is actually a simplified form, ⿰身⿱𫩠彐. Is the implication that this is unifiable with the full form ⿰身當?

I think that ⿱𫩠彐 should be a unifiable variant of 當 (with a new UCV). If not, then we can still encode ⿰身當 based on Evidences 1, 2, 4, and 6.

As requested in Comment #1766, we should add a new UCV for 當 and ⿱𫩠𫜹.

Provided by Lin Anning (林安玲): 周有光 《比较文字学初探》, 语文出版社, 1998.11, p. 195

▲ 朱少璋: 《粤謳采輯》 (《嶺南文庫》), 廣州: 廣東人民, 2016.12, ISBN 978-7-218-11379-1, p. 424

黄镇邦译注, 《布依嘱咐经 Moldangs》, 贵阳: 贵州人民出版社, 2011.9, ISBN 978-7-221-09714-9, p. 4