Well, I bit the bullet. I bought and installed a Little Giant WGP-65-PW
today.

I had to yank a lot of the aquascape fittings, but I used 1-1/4 PVC,
check valve, etc and some adapters to fit the pump to the 1-1/2 flex
PVC that runs from the skimmer box to the falls.

It's 30 watts more, but the end result works and the flow is
equivalent.

Thanks to all for your help and suggestions. If anyone needs details,
feel free to email me. Happy Easter!

-TomW