Hi
I’ve not heard of that custom. A friends family and possibly my own further back were gypsiesand I’m learning.
However I do know that many where I used to live were RC and would appear inburial registers. Also in cemeteries up north where I used to live there were quite a few gypsy grave stones with beautiful paintings in colour especially of the vans and countryside. The local fishermen also had them for their boats There were quite a few of both, really besutiful and sometimeswith a little portrait of the person
I guess local gypsies to your family might know. Maybe you’ll strike lucky here
Take care
Emms
