Your base kit has R3 @' and ~# in base but none of the rest of the keys for UK-ISO. They can both be removed because they are duplicated in the Nordeuk kit, and the base kit also includes R3 1u pipe which is all you need for physical ISO coverage.

For one-off keycaps people usually go for either
- SLA Resin print
- Resin cast (by first either cnc'ing or 3d printing a mold)
- MJF 3d print

For legends, the more popular solution is to have incised text and manually apply resin infill to make the text clearer, but this is a time-consuming process.

Both SLA and MJF 3d prints can be ordered at reasonable prices online in high resolutions.

There is of course also more advanced means of making your own keycaps like the Keymacs-way, showed in the video above, but the up-front cost of the CNC machine alone is quite high - and the time investment arguably even higher.

Thanks, that was helpful. MJF 3D printing is a new one for me.

Yes, I'd buy this if there was a round 3.