Not sure what you want to "bridge" from > to. You can use Blender 2.79 with 0.79 to import and save a .BLEND file which can opened in Blender 2.8 (the reverse does not work). Two issues at this point: 1) rF2 metadata may get lost, 2) you don't have the ability to export a GMT. If you want to 'bridge' to some other 3D app - FBX, OBJ, DAE, 3DS are all workable. You would need to do tests to find which works best for your situation. If you want to export GMTs from Blender then 2.79/0.79 combo is the current solution.