Get some adult pullups and decorate them with prints or stickers :O
Adult pullups are plain and don't work as well as tape diapers, but they are much better than diapers for babies in functionality!
I have some Seni pullups and they don't work for flooding, but Abena does some AMAZING pullups which feel like thick diapers! They take a good flood and maybe one more x)
Ah, almost forgot, try to find if "Kruidvat Pyjama Pants XL" pullups are sold where you live! They fit up to 65 kg! I don't think they work for adults but they are cute and a lot like Drynites.
ANOTHER EDIT! Babylove Pyjama Pants also exist! The L fits up to 50kg they say!
ANOTHER ANOTHER EDIT XD I also found Pampers Underjams Pyjamapants XL fits max 39 kg but it just might stretch enough?