analog mixing boards with stereo fx units

I have some stereo fx units including OTO Boum, Bastl Thyme mk1, and Beni dub phaser. Mixer is a 2000’s Midas Venice 32

The aux, monitor, and fx sends on my mixing board are mono jacks. There are two aux, two mon, and two fx sends

When I send signal to the Boum I want to preserve the panning that I have set on the individual track channels. But when I add in the wet effect send it comes out in mono. Duh, I guess..

I have a trs out of send on mixer to 2 ts going into the Boum L/R inputs… kind of a misunderstood way to plug it up but that’s where I’m at right now.

Is there any way to make use of my stereo fx units while the mixers send jacks are mono? Could I somehow employ two sends as a stereo pair or have the sends routed through a stereo channel?

The return jacks on mixer are all stereo, I don’t quite understand why the sends are mono. If anyone can help me wrap my head around this that would be much appreciated.

I have a Beni dub stereo phaser that is hooked up similarly. Trs to 2 ts going from mixer fx send to phaser inputs L/R. The outputs go to a stereo channel and the phaser has a mono-stereo switch that has a nice auto pan kind of effect when switched to stereo. But again I don’t think the individual track channels’s panning is preserved like this.

Is there any kind of work around or different configurations that you know of to help me make use of the stereo fx units in a more fully effective kind of way to correctly utilize their stereo capabilities?? Thank you