A 2764 which is the common one used for zeddies only requires two pins lifted and two wires soldered. It needs 21volts for programming which is usually outside the range of modern PC based programmers, the 27c64 as found on the early ZXpands requires only 12v.
Erasers can be picked up for a round a tenner from the land of the rising price, I've had mine about seven years and it does the job well.
The programmer I use was built at the time and can be powered by either the zeddy or in my case a ZX Spectrum.
If none of these things are available then perhaps contact Sell My Retro who I believe once offered a pre programmed device service though this may have changed.
https://www.sellmyretro.com/