I live in a place where growing plants can only happen with the help of irrigation, and we've used a storage pond for the past 20+ years. We also swim in it. We're not tropical, though, so some factors are very different from your situation.
The schedules of filling it for swimming/bathing, using it for necessary irrigation, draining it fully to break the mosquito life cycle, and keeping it full for storage for a later need, may clash. It can be a little hard to juggle all of those. But certainly better than not having it at all!
Vertical walls like the samples you showed above could be dangerous for non-swimmers who decide to go in for a bath. And are there dogs there? If they jump in could they get out? Vertical walls are also structurally harder to build strong enough to hold the weight of the water. If you could build it partway buried, and partly bermed up, with sloping walls, it might be safer. But it would take more space, which might become an issue depending on the land you end up getting. And it would allow more evaporation which might be less of an issue in the humid Philippines than in my location in the high desert, but we still find that sloped wall shape more desirable.
I'm sure you're more expert on this kind of detail than I am, but for breaking the mosquito life cycle, make sure to have the floor sloping with the drain at the lowest point.
Last year we had cement plastered our irrigation pond so it became more pleasant to swim in than the previously clay-bottomed version. So all our students were swimming in it daily, maybe 20 - 40 people using it over the course of a warm day, and I think ringworm (a skin fungus) went around. We were draining it every two days for irrigation, but maybe not fully because we don't have a mosquito problem most of the time. This might not be an issue for you with very few people bathing in it. Ours is much bigger than yours, but it still happened.