I also use a kiddie pool- for smaller ducks.
I set blocks of wood around it for easier access but they rarely use them.
Itās actually a little helpful....because if I see someone using the wood instead of hopping over the side.... I go make sure their feet are ok lol
Itās caught a few cases of bumblefoot early enough to not be a major problem over the last many years!
My next plan involves building a small deck for the pool, so I can install a larger pool with a drain and drain line to direct the gross water where I want it....
But my 5 Welsh Harlequins seem to be ok sharing a 42ā pool, and that is as large as I want to go for the every day (or every other day) dump, rinse, and clean that I need to do.
I always have a spare in case it cracks while dumping it. You canāt find them in the winter! Learned that lesson the hard way

The drain would allow for a larger and deeper option. With a proper drain, you could even go āwhole hogā and build the frame for a koi pond and install all kinds of fun things like a recirculating pump/ waterfall, natural looking surroundings, etc.
But whatever you decide on, you need to be able to dump or drain, clean, and re fill regularly.
....I guess it comes down to a combination of your budget and construction abilities, and what you feel will be best for your Pekins between the two.
I look forward to seeing what you decide to do
