A splitter on HDMI will not work because of the necessary High Definition Content Protection (HDCP) protocols that are part of the specification. Every piece of gear in the chain must take part in this protocol and ensure that high definition content cannot be illegally copied. This also limits HDMI devices to pretty much one in/one out or multiple in/one out types.

The Harmony One or other universal remote will allow your wife to properly configure the system (TV, Pre/pro, Blu-ray, etc..) for the desired activity with one button press. It will send the proper codes to power up each piece of equipment and configure that device properly for the activity. This will allow you to run the HDMI signal through the 997 without making your wife learn the details of operating each piece of equipment.

I use the Harmony 880 and it's made life much easier. I ended up using HDMI directly into the TV for the Blu-Ray, switching component video from the other sources through the 990, and running the WII component video directly into the TV (game mode picture setting to minimize lag time at the cost of picture quality). This means that I have to switch inputs on the TV and on the 990 for various functions. Before the Harmony I needed to keep 4 or 5 remotes handy and juggle them for different functions. Now it's just selecting the function on the remote and all the powerup, powerdown, and configuration settings on all pieces of equipment just happen.