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This is a concatenation of SIS-257 followed by SIS-258, and should be easy to implement as such.
See §2.2.3 in IOGP Publication 373-7-2 – Geomatics Guidance Note number 7, part 2 – April 2015.
SIS-257 Geographic/Geocentric conversions (EPSG:9602)
SIS-258 Geocentric/topocentric conversions (EPSG:9836)