"Stipend" is a troubling term, as different entities and individuals use it in different contexts. For most federal sponsors, a stipend represents a fixed amount provided to someone in a training program to offset their living expenses. It is not remuneration or compensation provided for work performed; therefore, the payment does not represent FTE or effort. Some non-federal sponsors will use the term synonymously with compensation for work performed.
So, in this case, a stipend would not be allowable, but salary or wages (compensation) would be allowable.