If you have schrader valves then you can get valve caps with motion sensitive lights.
There are also options like Pedalites or Ledals (sorry for the lack of links, replying on my phone). These have a standlight feature. Or Glowspec, no standlight but you can at least get metal pedals.
Personally, for a cost effective solution you could just get some of those green or amber cheap blinkies and fit to your forks facing to the side.