It's the first time i see that kind of earbud to iem adapter but there are some similar items on Ali that could be glued to a mic.
Yurbuds adapters:
https://www.aliexpress.com/item/32860195064.html
Silicon adapters:
https://www.aliexpress.com/item/33019014929.html
https://www.aliexpress.com/item/32968652740.html
(These are just the first results i found, if you want to try them make sure to get the right size).
Keep in mind that you wouldn't be able to use foams and the frequency response would be very different compared to real use.
I'm developing my own "poor man" diy measurement rigs, the idea is to get something that can get consistent results with minimum to no expense (i don't want to 3d print an adapter and buy a calibrated mic, all my money is already going into new earbuds
)
These improvised rigs can only provide consistency, don't expect accuracy out of a dubious thing glued to a cheap mic.
They can still be a useful tool to tune diy earbuds or to get an idea of the differences between 2 or more earbuds.
(Samsung earbuds mic in a polystyrene box on the left and Nokia HDS3 mic inside carved wood on the right)