I am an art rubber stamp maker, using a vulcanizer to make art rubber stamps from molds that are usually created with a magnesium plate.
The normal process is to send artwork off to an engraving firm to acid etch the magnesium plate (11 pt depth is desired) and that metal plate is then used with uncured matrix boards (a bakelight type material) that is "cured" in the vulcanizer that is then used over and over to make as many images of the rubber stamps as one would want. The vulcanizer heats up to 300 to 320 °F, and one usually uses 2000 to 2500 p.s.i. of pressure for 10 to 15 minutes to cure a mold. Once the mold is cured, it is impervious to the heat used in the vulcanizer, and the heat is used to cure the unvulcanized rubber (again, 300 or so degrees, 2000 psi, or so, for 8 to 10 minutes.
In reading up about the melting points of SLA and ABS, the 200 °C equates to around 460 °F, so there doesn't seem like the heat of the vulcanizer will be an issue, and the pressure isn't applied all at once, one usually allows the uncured matrix board to heat up before the high pressure is obtained, I'm just curious if any other stamp makers have had success with this method and/or have any suggestions about STL files for this type of printing, if there needs to be 2 or 3 degree shoulder angle added to the file configuration, or any other suggestions.
I don't know if I understood your question properly. You using the mold to create a rubber stamp and then you use that to stamp over stuff? If so, you simply can use 3D printing to create the stamp, if not, my answer is rubbish.
You can use a flex material to create the stamp itself and then use some hard material to create the handle. Also, you can create a mold around the stamp and use resin to fill it and/or create a resin mold and then use that mold to create the stamps by filling the "holes" with more resin.