I've had another idea---
....
>><b d j g>
> bh dh jh gh (breathy vd.stops/affric) CHANGE TO b d j g
>
>><ƀ đ>
> b d (tense vd stops) CHANGE TO bb dd
>
>><ph th s x ch ch kh h>
> f th s l-bar ç x qh h (vl.frics)
>
>><bh dh z l jh gh>
> vh ðh zh lh çh gh (breathy vd.frics) CHANGE TOL v ð z l ç gr or gh (or,
> if you decide to use diacritics, there's the g-breve of Turkish IIRC)
>
>><ƀh đh ƶ ł>
> v ð z l (tense vd.frics) CHANGE TO (maybe) bv dð zz ll OR vv ðð zz ll for
> consistency
and you might use "Vh" for some of the V+schwa diphthongs???