Yes this would be possible. I have been planing to do the same for the tilt on my RF blinds as they only have UP Down Stop aswell(and then use a suntracker for automatic control), but not had time to look into it yet. Should be easy to reuse it for HDL once i get around to it.
Have been looking for a premade palette or solution with the function described but not found any i can use yet. (I am sure that other people must have made this before) It would be possible to make it with scrips etc. from scratch but this could be more complicated and might need different flow for each blind.
Have seen this post where they made support for the same function back in 2017 but not had time to check if this is implementable to the MQTT covers or what the current status is there. I do not have that good understanding of how HA works.
Update:
Did they happen to have a new firmware for you module?
Just found this thread where the needed function is premade for Nodered UI. Will try to see if i get some time to try and modify it for HA - HDL tomorrow.