The 22-year-old's CV includes two further class victories at Mount Panorama, third place in last year’s FIA Motorsport Games, and races in the Porsche PAYCE Carrera Cup Australia.
Indonesian driver Santoso contested GT World Challenge Asia’s GT4 class last season and finished third in the standings following two victories.
Team co-owner Earl Bamber said: “It has been a massive off-season for the entire EBM organisation and I am extremely proud of this announcement for everyone involved – I cannot wait to roll out with our cars for round one.”
Sepang hosts the opening round of GT World Challenge Asia’s 2020 campaign on 28-29 March.
Buriram, Fuji, Suzuka and two events at Shanghai – the second a three-hour endurance race – complete the championship’s six-round, 11-race schedule.
Quotes: Brenton Grove
"It’s really exciting to be joining Setiawan and EBM for this year’s GTWCA season,” said Grove.
“EBM have proven their credentials in international GT racing, so to join them in a Porsche 911 GT3 R will be a great experience.
“Hopefully I am able to pass on some of my experience with the 911 GT3 R, share some insights to help Setiawan with his progression and try and claim some strong results for the team.
“Setiawan is really passionate about his motorsport so I am thrilled to be sharing a car with him. I have only been to one track on the calendar this year so no doubt I will be asking for a few tips from him too!
“I have watched the series for a few years now so I am quite keen to get started working with the team to try and put our best foot forward, hopefully claiming some silverware along the journey too.”