Sadly the only place that seem to have Cherry profile PBT ISO enter is Cherry ZF, and they will not sell only keycaps, and especially not only specific keycap. They only refer to GMK who does not make PBT, and BSP who does not have ISO.
New PBT molds are $12,000 each ($7,000 figure I had before was for POM molds apparently) at the factory though 7x space may even be more possibly. BSP is also missing the same amount of keys, no ISO enter, no 1.75 shift, no 1.25 or spacebars. It seems like a cruel joke or something.
Other row or sizes novelty/specialty key will probably not happen this time, if there is enough demand may be able to convince for next time. I have asked many time about making only set of modifiers keys, but have not been able to convince.
ISO layout on ANSI are a cinch, just move one key, and either drop a key or move it as secondary legend to assign to an Alt Gr or something.
Still working on a few concepts, will try and get stuff up and order form done later in the day.