MOTM

> The other option would be to replace the TLC555 with a regular 555
that can flash lights and ignite blasting caps...

... and probably put noise on the power supply. The 555 seriously
crowbars its supply when ti goes over.

> and increase the size of its bypass cap.

It'll probably help, but it won't completely keep the crap out of the
supplies. Maybe use a little series resistance in the power line too??

Tony