'considering you don't find it important' feels a bit too judgemental. In such case why not just ask: 'Since [reason x] I propose to do y. Please let me know i

'considering you don't find it important' feels a bit too judgemental. In such case why not just ask: 'Since [reason x] I propose to do y. Please let me know if I should proceed. If they don't find it important enough to answer, you can just follow your own good judgement, backed with a papertrail. Still personally I find all above tactics a bit pedantic and not enough to the point... often I just communicate what I am doing and what my next intended steps are, in standups and followup meetings. Or in-between, I just send mails with stakeholders in copy. I will hear it soon enough if someone does not find it a good idea or has a better idea.