The 3D printed wine bag stand (and another one!) worked perfectly. I was able to hold both bags while I was pouring in the XTOL.
The XTOL mixes up 5 liters of developer... and each bag holds 3 liters, so all I had to do was divide it in half and they'll all fit back to the boxes.
And fit they did.
All I had to do was evacuate the extra air that was leftover in the bag and it's all good!
I just have to shoot a lot more film now!