I’ve been searching for the exact same things, and this year I finally found a set of ottoman artillery on eBay. I think that’s about the only chance you have. Just check often and see what shows up. Otherwise the only other thing I’ve found is that Egyptians work well for the Ottomans, and you can piece together some solid cavalry forces out of the many Strelets cossack sets. Even some of the WWI Russian Cossacks might be of use

I've actually ordered that one, but eBay won't ship it due to "sanctions" lol I've contacted the seller, hopefully he'll consider shipping it to me again with another courier.

Yeah, Anglo-Egyptians work well, so there are no shortage on the infantry front. Too bad there's no good Egyptian cavalry for use. My other plan is to snip the heads of any spares from HaT's Egyptian Camelry and stuck it to other HaT's cavalry, I'm thinking of British 17th Lancers.