migrate instantiateProcess of RepairAPI (groovy)

Hi all,

the goal is to start a new process through groovy and apart from defining some process variables, we want also to define its start activity (no to start from the begining).
e.g. in 5.9 the RepairAPI implemented
instantiateProcess(ProcessDefinitionUUID processDefinitionUUID,
Map<String,Object> processVariables, Collection<InitialAttachment> attachments,
List<String> startActivitiesNames, String instanceInitiator)
At Bonita 7.5 how can we do that?

thank you in advance