You mention a British program. I do not know about the specific features you mention, but a British company called Serif used to make very highly-regarded DTP software.
Serif (makers of Affinity suite) were bought by Canva last year. So far, they’ve honored their perpetual licenses and still offer them, but it seems like a perilous proposition given Canva’s audience and sales model.
The last big RISC OS program written in BASIC and assembler. I published something through Cerilica called TextFX, also in BASIC and assembler.
There was also Composition, by a chap from New Zealand. Multiple transparent layers of any size and position, and and interesting system-wide plugin system.
You could generate some sort of hash of the selected options, encode it with something that’s short and human readable and then share that on the screen?
Something easy for a human to transfer like honey-chair-balcony or something. Store the settings in the backend against this identifier and then you can retrieve it later? So you still need a backend but no need for accounts
I think they were bought by Corel
Edit: Serif are in the article, sorry