I've played plenty of gigs without amp over the last 30 years. Starting with a Yamaha FX500, the Behringer V-amp Pro as pre-amp. Now I use a Joyo American Sound, AC Tone or Award-session JD10. If I'm not sure about the monitoring, I take my own DI and a Behringer B205D. I can split my feed into the B205D and the PA. I then take the monitor mix into the B205D and mix the two. As it is small, mounts on a stand pointed at my head, it doesn't interfere with FOH. On a silent stage I can hear myself without upsetting the sound guy.