In my opinion, the simplest option would be to install an aftermarket TPMS system.
It definitely wouldn't be that easy to equip a Latin American CX-90 with TPMS sensors in the tires. The capability would also typically have to be enabled on the car, possibly using Mazda Diagnostic and Repair Software (MDARS) or a comparable program. That will only function if the device is not locked to a specific region and if it is compatible with the software and hardware of the car.
Adding or replacing parts generally won't help if the vehicle's software or hardware doesn't support TPMS. If my memory serves me well, the TPMS and keyless entry wireless receivers are housed in the same module. Whether or not your keys function, among other things, may depend on whether or not the Latin American module supports TPMS. If it doesn't, then you may need to replace it with one that does.
While researching this topic, I came across some online discussions pertaining to the Philippine market, where Mazda also chose not to include TPMS. No one in those discussions managed to activate TPMS on their Mazda.
You might have to locate a helpful Mazda technician who is willing to fiddle with the MDARS settings if you want an authoritative response, though. Unlike the Volkswagens sold in the US, which used indirect TPMS, I don't think this is very likely. These could be configured to use TPMS sensors through ODIS, which is VW's version of MDARS.