An alternative could be Flashfish A601 portable power station, it has pass through and UPS function, but its expensive at 430 USD, and Lazada does not have that version. I can only guess at what the import duty would be.
Also, they charge 170 usd for a 100 W solar panel, and i need 3-4 of them, seems a lot.
In all the payback time becomes too long.
Ecoflow also does UPS, but more expensive
Bluetti may be able, if you manage it right
Jackery cant
Anker maybe