Hooray! Finished making my replacement LED turn signals. Turns out the original turn signal relay CANNOT be replaced with a standard automotive type. So I ended up desoldering the annoying speaker from the original one and putting it back in.
Arrays of ultrabright 3mm white LEDs mounted in white polyethylene behind fluorescent amber acrylic.
I was using a tripod and a handheld light this time so the photos turned out much better.
Tomorrow I will be using an angle grinder to cut the bike pedal axle off.
Video of the turn signals