Inseam won't be your issue - hemming is easy and inexpensive. Waist is tough, though -- that's super lean and I don't think many brands carry jeans in waist sizes that small. Maybe you'd have better luck with one of the Japanese brands?
Or you could try posting the question to one of the industry professionals on the forum, like Kiya in the Self Edge thread. He or someone else in that position might have a good sense of what brands might carry smaller sizes.
Thanks. I'm leery of alterations shops ever since one lost my favourite shirt ('90s Versace olive green shirt, beautiful, needed a couple repairs), so I had better learn to sew! Yes, even SLP doesn't seem to go down to a 23"-24" waist even though I'm pretty sure their runway models have that kind of waist! Any recommendations for Japanese brands? I only really know CDG, Issey Miyake, and Uniqlo.
I'll see what Kiya has to say. Does he reply to PMs?