waheguru ji ka khalsa waheguru ji ki fateh.....
I too wanted to know about this pankti so i did many gursikhs and puratan keertanis too :-
Here is one of the reply from a well known gursikh -
Near about 1965 , late sikh scholar Giani Gurdit singh jee gave us a pamphlat, edited by Akali kaur singh ji (nihang) from a long period sdo sahib & than so many kirtanis sang these lines. But from that period I am also in search of these lines but not succeeded.
This was the common reply from few other singhs who had good knowledge about sarbloh granth and dasam granth. And they too were not clear about these pankitis as their source was not clear