@jeerouss You should be able to return it after opened. It just needs to be in as-new condition, that’s all. I think you may need to do this within 14 days for a full refund.
In any case, the Quest Pro needs a stronger GPU to get the best out of it compared to dedicated PCVR headsets like your G2. This is because the GPU needs to handle compression/encoding with Link or Air Link and this can use around 10-15% of your GPU resources. Nvidia rtx series GPU’s have faster encoders than AMD so you should favor Nvidia rtx gpu’s imho. With MSFS probably a rtx3080 12Gb or better should work well.