It would make sense to have these badge numbers in larger characters on the front and/or back of the uniform, whether they are in riot gear or just their day-to-day uniform.
As a forward looking policy, agencies should generally prohibit obscuring the agency and officer identification for uniformed officers and design those things to enhance their readability and prevent common practices like mourning bands from obscuring them.
As for the body camera policy, Seattle has a history of using video surveillance during protests to identify protesters for later prosecution, in particular this happened during the WTO protests and Iraq War protests.
A common call from protesters has been that journalists and photographers documenting the protest avoid publishing clear photos that would allow the police and other parties the ability to identify protesters, so there are conflicting calls on that particular policy.
I think the long term solution to that is a legal disincentive for police departments to prosecute protesters and a trust in the police and judiciary that they can take such recordings and use them for accountability rather than prosecutions.
As another poster commented, police have reacted to it by putting electrical tape over those numbers. The problem of getting that tape removed is considered near-insurmountable by Seattle's mayor, and the SPD police chief - who both acknowledge it, but for multiple days in a row, are somehow unable to get it solved.
The advent of our panopticon arguably makes this less important. Maybe we should keep expanding that.