I'm guessing the answer is "no" but I saw this question and got curious. If panel fillers are expensive, and you don't have a breaker, can you 3d print your own? I'm guessing the panel front cover and fillers are part of UL and therefore making your own is against code?
Print plastic blank space fillers for the service panel
code-compliance
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Best Answer
You need to provide protection "substantially equivalent to the wall of the equipment..."
The governing NEC requirement for loadcenter "blank space" filler plates is in NEC 110.12(A):
...which is much easier for a DIY to provide with sheet metal
This points us to what the wall of the equipment is required to provide, and that, in turn, is set out by NEC 312.10(B):
So, I'd use a piece of 16 gauge (or 1.6mm thick) sheet steel painted to match the existing cabinet, fastened with Garvin GSSTs (these are fairly short 10-32 self-drillers) in suitable places, as my "blank plate" if you couldn't find a manufacturer identified blank/filler and plugging the opening with breakers wasn't an option.