How do I insert [3rd Party] VST on Midi Channel ?

If I’ve miss understood what you’re trying to do sorry but trying to be helpful.

You need to have a midi track set up with the midi output going to your HW synth.

The audio outs need to be coming from your synth into the soundcard and routed into a Cubase audio track (Yellow monitor buttons on for both tracks).

On the audio track use the insert slots to open the effects you want to hear.

For the Glitch or EFFECTRIX type effects to work you will need to press play or record on Cubase as you Jam.

Just tried this on my system and working fine.

Included a screen shot of the setup.