I fail to see the need for an inducement when it is a straight forward legal process that each Land Office is obliged to do as part of their salaried duties.
In my case the Sankamphaeng Land Office calculated a one-off fee of 12,00THB which would be the average amount per month to Rent a decent home in my District. (The Usufruct was seen as a Rental Contract with terms ranging from 20, 25 and 30 years, inluding the size of the home). I elected 30years.
I am not married but do appear on my partners' Chanote and Blue Book. (I do have my own Yellow Book and Pink ID Card).
I later attached all the relevant documents as a Codicil to my Thai Will.
PS. My partner paid the 12,000THB.