Yes, you can plug a trigger straight into a mic pre. It will just record a simple spike of audio. You could then use Drumagog to convert the trigger spikes into drum samples. Another alternative if you use drumagog is to use a microphone. You can tap in a drum beat on a hot microphone and replace those taps with samples using drumagog.
Otherwise you would need a brain to convert the signals.
Some DAW's will convert audio into MIDI. For instance SONAR will scan an audio track for transients and insert a MIDI note for each one. I don't know if reason will do anything like that.