OpoLua: the return of Psion!
View MBM image files, OPL scripts, and AIF resources, listen to sound files, and run OPL scripts and programs from Psion and Psion-compatible computers on iOS and iPadOS... More here.
It's not perfect and it takes some time to understand how to install files, but this is a welcome development for those of us who have never forgotten the magnificence of the Psion system.