Can a timber beam be used instead of steel I beam rsj?

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Hi folks, I’m currently building a granny annex at the end of my garden, built from concrete blocks with a 100mm cavity. measuring at 7.2m deep, 5.2m wide and 2.5m high with a flat roof

Iv been toying with the idea of bolting two roof rafters together to make a beam to hang the roof rafters from, instead of using a steel I beam RSJ. As I believe this will be more cost effective in materials and labour.
(Beam width approximately 4.8m)

I just wanted to know if this is a good idea or not? And if so what size timber would be most suitable?

Would appreciate any suggestions many thanks
 
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