Ah, yes, you are correct. I got temporarily transfixed on something else.

None of the Indo-European languages (to the best of my knowledge) have future participles due to none of them having a true morphological future tense. Therefore, there future participles are not possible.

Future tense, depending on the exact language, is expressed in Indo-European languages either with the use of an auxiliary or a modal verb or with the use of a perfective aspect of the present tense.

Esperanto is the only language that does have the future participles, but that is another bedtime story.