[nullwasamistake]

Probably, although you could shape the shield not to.

It's still far more complex than just attaching the thing right to the telescope. And glancing starlight leaking in between the shield and the telescope could be a big problem.

I looked it up, the original proposal was actually to use a mobile shield to occlude far away stars for direct planet imaging. I think a similar approach could "fix" JWT but let's hope we never get there