Accucovers for hft was discussed many moons ago when they where first available, it was deemed that they are an optical aid therefore not allowed for hft.
Copied from the current rules
"Apart from a traditional scope no other optical aids are allowed. No wind indicators or scope levels can be used and must be removed or taped up before you start the course".
HFT, for people with only 2 buttucks!
VooDoo TwoTwo The next chapter.