I have typical high-frequency hearing loss and am using Oticon OPN 1 hearing aids. I do a lot of birding and find that with these aids I can hear the majority of bird songs reasonably well. I have turned on the speech rescue feature which has the effect of shifting some of the higher frequencies down to a lower frequency band and it seems to help with some of the bird calls that are very high pitched like the blackburian warbler and the grasshopper sparrow.
It doesn’t give you perfect hearing for those high frequencies but it does help a lot. With the aids I do much better while birding than without them. There may be other brands of aids that work as well or better but the Oticons seem to do the job for me.