  Typing mathematics is sometimes difficult with text editor functions for
students with motor impairment and other associated impairments (visual,
cognitive). Based on the HandiMathKey software keyboard, a user-centred design
method involving the ecosytem of disabled students was applied to design the
HMK-D physical keyboard for mathematical input. We opted for the Stream Deck
device because of its multimedia features and its appeal to young students to
the HMK-D. Preliminary tests with 8 students (5 in secondary school and 3 in
high school) shows that HMK-D is highly accepted, accessible and fun for
mathematical input by students with impairments. A longitudinal study of the
usability and acceptability of HMK-D is planned for the 2023-2024 school year.
