Block programming in a digital environment, where graphical elements are used to build the program, is not a functional way for braille students to learn programming. As an alternative, you can create tasks using tactile code bricks or similar tools that are designed for braille students. Code bricks can be useful in the transition to the student starting to program in text using a computer.
Another solution is that when the students work with for example Micro:bit, a common digital environment where the students practice block programming, everyone gets familiar with the associated text programming in parallel. This way of working contributes to an inclusive learning environment.
The 3D-printed code bricks/code tiles in the picture can be a helpful tool for different kinds of programming. The code tiles show that programming requires using different instructions in a specific order.