In a school setting where the policy is that all students say birkat haMazon after eating together,
is there any source which would allow a student who has not eaten bread to still say birkat haMazon with the group so that he is still part of the group. The school is a Jewish school, but most of the students do not come from religious homes.
Unfortunately I don’t know of any sources that would allow a student to say birkat hamazon when it is essentially teaching them to make a bracha l’vatala. We will have to look for other occupations for them to do while everyone else is saying birkat hamazon, such as them saying al hamichya or borei nefashos, or if applicable to provide them with an incentive to want to eat bread and be part of what everyone else is doing.