There is nothing about a trailing-edge dimmer that requires digital control any more than a leading-edge dimmer. Here are a couple of practical circuit descriptions and circuit diagrams to eperiment with the scheme.
http://sound.whsites.net/project157.htmhttps://sound-au.com/project157.htm
http://sound.whsites.net/project159.htmhttps://sound-au.com/project159.htm