Cost-effective convex keycaps? 1.75u and under

So, I figured y’all would be the best people to ask. I make fairly traditional row-staggered hand-wires, but I like them to be stabilizer-free, due to my home tooling limitations and a realization that they work fine. They also avoid one of the biggest pet peeves across the various niches of keyboard people. What is the easiest and cheapest way to come by a handful of convex keycaps at 1.75u and under, to use as spacebars? I can make a lot of different combinations work, so “mix kits” in Cherry or MDA or XDA seem the most likely to be useful, but I’m not sure.

With the sole exception of the Enter key (which at 1.75u will need to be labeled CapsLock or Control for most keycap sets), most keys can be sourced by being a little careful with which sets you get, even in sculpted profiles. Numpads require a bit of care too, as many don’t have the two to occupy a “split plus”, but they’ll usually have something usable for that, as well as a shrunken Enter.

I can find blank keycaps easy enough, and they work pretty well for XDA, but other profiles can get a little uncomfortable on the thumb, and only some benefit from being turned around.