Yes. The SMH10, SMH10R, 10R, 10C, 10S and the 20S offer the ability to use your own earbuds. The SMH10 has 4 different clamp kits that have an input for earbuds, the SMH-A0303, SMH-A0304, SMH-A0305, and the SMH-A0306. The SMH10R, 10R and 10C has an earbud cable that is sold separately for the use of earbuds, SC-A0305 for the SMH10R, 10R-A0101 for the 10R and 10C-A0101 for the 10C. The 10S and the 20S has an earbud port built into the clamp kit underneath the rubber cover with the headphone icon.
Here are the models of Sena headsets that allow provide earbud support.
SMH10R with the SC-A0305 accessory
10R with the 10R-A0101 accessory
10C with the 10C-A0101 accessory
10S with the built-in earbud port
20S with the built-in earbud port