The Tele-Ektra looks interesting to me, after all it provides 4 different shutter speeds.
I found out that there is the rare AF100P mini flash unit for the Pentax, the standard flash unit is quite huge. But even the AF100P is 63 x 49 x 48.5 mm, so not really pocketable.
I thought about choosing a flashless camera and attach a tiny flash onto the hot shoe, there was a crowdfunding project about a very tiny flash (
Moon Tiny Flash). but it never made it to production. I'm not aware of any existing flash units of that size.
I also realised that there are very slim 35mm rangefinders which are actually pocketable and have a flash, like the Minolta TC-1 (99 x 59 x 29.5 mm), which lacks the telephoto lens though.
APS is also still an option for me as I still find bundles of expired APS film on ebay and I found a
guide how to process it.