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Sorry, completely misread your question as your title set off alarm bells in my head. The words "safe" and "eyepiece Sun filter" do not normally go together.
I guess it would be no different to welding glasses but emphasis on guess. How safe are welding glasses anyway for solar viewing? Even if safe you have to ensure that the secure mount stays that way and the filter doesn't fall out. You may get some heat buildup between the filter and the objective, not sure unless tested.
Just prior to the last eclipse I found out that even Baader AstroSolar film was not safe unaided and needs glass in to optical path to eliminate UV according to the latest standards that came into play after a previous eclipse. A newer unaided version is now available.
The solar finders are not that expensive ($29 for Kendrick) or you can make one similar and it's a far safer option.
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