Yup. I tried getting them to do some plexi work for my FC block plate(wanted Red Plexi) and Eddy told me they couldn't do that. I guess he thought I wanted the Acetal to be Red Plexi. What I wanted was the metal access plate to be replaced with a plexi cover instead. So I seriously doubt they would consider milling a replacement top for a HF block.
Which is too bad. They really should at least consider producing replacement parts and selling them for the masses than hold EK blocks and sell them to their vendors on a case by case basis and have a stock of 25 of each type on hand at their site. Not every one wants to replace their block every time they upgrade their system if they don't have to.