Make Z-limit to depend on tool-length

Hi everybody,
I'm new here, hope you can give me a hint.

I have a 3 (+1) axis CNC mill running with linuxcnc for a while, works great. I do not have a toolchanger, so everytime I'm changing to another tool the length is unknown. Therefore, I added a tool-length probe on a fixed position on the table. I remapped the M6 command so that a tool-length probe is initiated automatically and the tool-offsets in the tool-table are being updated - this works.

To my question:
I setup the z-limit so that I can hardly reach the table with the shortest availabe tool. But when I put a tool in, there is always the possibility to drill in the table. Is there an easy solution to make the z-minimum moving that amount of the tool length? To avoid a hole in the table

Thanks
Schorsch

I don't think Linuxcnc has table protection.

But I've never been terribly impressed by that option. I don't see how it can help much, since the same operator error that would cause most table mishaps would defeat the table protection on other machines I've seen.