I usually use IEMs and have my own mix from the PA. I do this in part because I really need to control the volume or I have lots of problems with my old and damaged ears.
Recently however, the band played an out-door event with a vendor provided PA that couldn’t support our IEMs. I sent Helix to FOH using the XLR outputs, and used the Helix 1/4” outputs to feed my on-stage FRFR, a pair of JBL EON610s. My monitoring solution was to use my IEMs as ear plugs to protect my ears, and take a stereo feed off the EON610 outputs to my P2 headphone amp. I turned the volume on the P2 up so I could just bearly hear my guitar in my ears, just putting back a little of the high end lost from using the IEMs as ear plugs.
This is by no means ideal. But it actually worked pretty well. I personally don’t need to hear a lot of vocals to do my lead vocals and harmonies. The bleed from the monitors and hearing my voice in my own head with ear plugs is fine. It takes a little getting use to, but I’ll live with that over loosing my hearing.
So my point is that sometimes things that aren’t ideal can work pretty well. Don’t be afraid to try things and compromise. But most importantly, protect your hearing, you might need.