Shimano hydraulic hose - BH90-SB compatible with BH90-J/JK
Are the two hoses compatible?


Judging from related questions and my experience, Shimano hoses are interchangeable (same for calipers) and most people won't notice the difference without dedicated comparison procedure.


  I am aware that BH90-SB uses a banjo connector, obviously that need to
  go. Can I just cut it off, fix the pin and olive and connect it to the
  R7070?


Yes, that will be enough. You should be able to use standard Shimano caliper inline furniture(page 13).

Just in case, R7000/R8000/R9100 series hydro shifter require special flanged bolt.