other thoughts:

1) a compressor adds to the sustain that is characteristic of a steel guitar... notes can be held longer without fading out

2) if you have a guitar synth, it might have a pedal steel patch that would get the sound even closer; But if you use a synth patch, include the guitar's original sound too in order to get the naturally occurring overtones and harmonics that tend to be missing from synth patches.

3) if the harmony pedal has an option to add the harmony ABOVE or BELOW the played note, experiment to see which gets you closer to the sound you're looking for. (In my setup, I preferred the harmony BELOW)

4) some reverb pedals have two options for the reverb tail:
in one case the tail stops when you change notes...
in the other case the reverb tail continues even if you change notes. The 2nd option sounds more like a pedal steel.

5) some effects pedals have a SWELL option... using it can soften the attack and make the picking less noticeable

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0