I've just gone down this road.
Fleetscale have a few frets of etch available, including the floor gratings for Carley floats
but the above J Haynes has the best designed fret for your Royal Navy inclined ladders. Likewise, I went with his 2 & 3 hole stanctions as they are individual pieces so you distance them apart to suit yourself, the great pity is there isn't a single hole stanction available.
So I used his .5mm 'eyebolts' into the end of some .5mm brass tube to get single-hole stanctions. I also used his 1/96 USN handwheels for cable reels (I couldn't find a fret of anything suitable).
So all you fret designers out there, why doesn't someone do a generic fret of 1/128 'RN capital ship fittings' with things like a few styles of mesh and/or grating, boat rowlocks, oars, cable reels, handwheels, pulleys and sheaves, mast and yard fittings, aeriel spacers, ladder rungs, doors, fine chain, shackles, louvre panels or vents, and suchlike.
Every 1/128 battleship model will need one of them along with the frets for ladders, stanctions, etc.