Example of sketch writing to AVR flash using Optiboot functions wanted

It would be easier to submit args and a list to write to flash with tabled pointers and support than even think of requiring writing upwards to a few 1000 PROGMEM lines... as my utility now requires running a list to generate Arduino PROGMEM source lines.. it doesn't get used. The user word set should load direct but I don't find online a set of write functions at the syntax level.
Please, links gladly accepted!

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