I have a silicone version of this (no longer available on amazon) I've used for a couple of years. My mi band actually counts my steps more accurately than on the wrist. I do not have the one in the link. https://smile.amazon.com/dp/B07T8LYN4T/ref=cm_sw_r_cp_awdb_imm_NJ3F39CV824GC7AEVXCQ

For reference this is what I have https://smile.amazon.com/dp/B07N2NDX8D/ref=cm_sw_r_cp_awdb_imm_0B66BD928RHBRHAFV350?_encoding=UTF8&psc=1

You may be able to modify a cheap bracelet model