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Just get a dsp and put it in your amp rack. Then set the limiters to kick in once it gets past the level you want. To me this is something better done in the amp rack on the dsp rather than on the mixer but, you could still use the limiters on the main outputs.

The main problem with what you are asking is what weighting to use and what time slice to take. Do you want average, peak or what?

For about $40 you could buy a cheap db meter and just set the limiters where you want and leave it.