Talk to a dealer. I've read of a few of these units having that issue and there may be a free repair, kinda like a recall but without notifications sent out, I think it's called a repair campaign. If not, maybe a call to corporate would work. I also read of one guy that whacked the pedal with his heel a few times when it would stick and it would then work for a while. If it'll free up, then bleed it out maybe it'll fix it. Maybe smack the ABS unit with a small hammer if the pedal won't free it up. If it'll free up I'd go out and do some intentional hard braking to activate the ABS and get shit moving in there, then bleed it to flush out any corrosion debris. It's unlikely clogged in the typical sense of stuff getting into it, I'm guessing moisture and lack of activation lead to a stuck valve. If it works I'd add doing a 'lock up' to my regular riding routine to keep it from sticking again, it's also good practice to know what it feels like.
Tho deleting it may hurt resale value, it probably won't drop it by $1,300 and some people might even find it a bonus since it appears to be a troublesome unit.