Leaving COG treatment during consolidation

Hi all, my son has Neuroblastoma stage 4 MYCN amp, currently in Australia COG protocol, achieved NED end induction.
Currently half way through first ASCT (consolidation) looking into transferring to SJD Barcelona once recovered from first ASCT to complete consolidation and balance of treatment with Naxitimab.
Has anyone else done this? Probably should have headed over there earlier by the looks.