gutter fascia bracket spacer for galv gutter?

[marmic]

morning all,

 

Intention is (or was!) to use a galv roll front steel gutter (eg lindab / galeco etc) but must have a spacer (circa 20mm ish) behind fascia bracket for ventilation into roof, and to position gutter correctly to prevent overspill.  But none of the manufacturers I can find offer this -  any bright ideas please of what to use that will be visually acceptable?  Single storey and will be at eye level on the one elevation as ground level rises.  Fascia is clad with anthracite grey steel to match roof.  Bracket has to be fixed to fascia - no rafters etc to fix to.

 

My other option is osma stormline black - but second choice and waiting for them to answer with regard to how their spacers will work with brackets (they didnt know yesterday!!)

 

or any other bright ideas please?      here's hoping