Ipe although tough as iron, considerably outweighs teak. I would suspect a custom, removable Ipe boarding ladder, long enough for swimmer access, would be impractical on most boats.
When we found that we needed a side-mount boarding ladder, I envisioned building a wooden unit, remisiscent of the teak & bronze hardware beauties on those classic, wooden "gentlemen's yachts" from a century ago. I nixed the idea, due to the sheer weight of those things.
Stainless steel is aesthically compatible to most boat's stanchions. But I do agree, it is nice to dream of beautiful, but impractical boat fittings.
Here's a boarding ladder custom built by Nauticat yachts for a fellow Nauticater . . . a bit over the top, but way cool: