I don't see any mention of that ballast being dimmable, even on the manufacturer spec sheet. Plus, dimmable ballasts have another pair of wires to connect the 0-10V control. You might want to look for a different light source that will dim natively.
An LED tube would need a dimmable LEDdriver, not a ballast. Plus the LED tube would need to be rated to dim. The actual fixture or device to hold the tube would just need to meet the requirements
of the LED tube selected I guess.
If this is for a show I would get the fixture and just hardwire it to a shoebox dimmer with double outlets. On the other outlet I would set up a ghost load to cut down the led glow. This in turn gives you control of all of it as well from the shoebox dimmer.
What LED product are you hoping to use? Lots of fluorescent replacement LEDs involve removing the ballast, and I would tend to expect that to be true of any that claim to be dimmable. Fluorescent dimming was always awful and very limited, so it would be an odd choice to start from that poor footing and then add all the complexity of effectively dimming LEDs on top.