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no personal experience with it, but friend of mine had a PX4 full size and subcompact. he kept the full size but got rid of the sub compact and replaced it with smaller Kel Tec PF9 ... he told me he was most disappointed in the recoil of the subcompact PX4 compared to full size - full size, in addition to extra size/weight, has a rotating barrel design that reduces recoil impulse - the subcompact does not have rotating barrel.

what similar functions are you most interested in compared to your Beretta 92 and Ruger? double-action trigger with exposed hammer? thumb safety? decocker?

A Sig P239 would be similar, though with a decocker instead of a "safety" and IMHO is probably a better gun (caveat again that I've not shot a PX4, only fondled them, but have shot a few P239).

Also consider a subcompact Smith & Wesson M&P with thumb safety option ... but difference between hammer-fired and striker fired may not be to your liking

also doesn't CZ make a subcompact now similar to the model 75 that would seem to be very similar battery of arms? If not in 9mm, they do still make the model 83 in .380

Bersa? in addition to the well known Thunder .380, which is nearly identical controls to your guns, they also make 9mm and .45 pistols

Also the Beretta 84/85 and Browning BDA would have similar battery of arms, but also in .380

lastly, some of the older Smith & wesson steel and aluminum frame semi-autos would fit the bill .... model 3913, chief's special 9, etc.