I’m working on a new SIP to adapt the existing L1<>L2 bridges to conform a standard deposit/withdraw interface that the Optimism team is defining.
Optimism standard: TBD
SIP PR: SIP 115 - Optimism standard deposit/withdrawal interface by ajsantander · Pull Request #402 · Synthetixio/SIPs · GitHub
Code PR: Adapts the bridges to Optimism's standard deposit/withdraw interface by ajsantander · Pull Request #1105 · Synthetixio/synthetix · GitHub
Once the SIP is up, please feel free to discuss here.