At the moment, there is no “proper” way to implement custom lines. However, you can add these sort of graphics as Text, in the form of a repeating glyph. Bravura implements as host of different lines — the conventional trill, vibrato and glissando wiggle, as well as sine, square and rectangle waves and much more, in various densities/frequencies. You can find them here. Copy many iterations of one glyph as Text, change the font to Bravura (or Bravura Text) and move it into place in Engrave Mode.
Regarding the independent repeats, they can be added by selecting the barline you already have in place and holding Alt as you select the adequate repeat in the Bars and Barlines menu, or by hitting Alt-Enter instead of Enter when using the popover.