like I said the hot nozzles have no effect on my fingers.

Flashprint is an excellent slicer - I use it for my replicator clone as it gives much better results than s3d.
And they are the only 2 that generate x3g files without hassle.

But I don't think any other slicer will output whatever a .gx file is.
So you are probably tied into flashprint.

The only other way I can think of would be to change how it lays down the strip that's supposed to get rid of gunk before you start printing - there are definitely options on that.
If you could have it right at the front of the bed and affix a brush there somehow, that could work.
Also it might be possible to change the actual profiles for the printers - if they are stored as seperate files - they might be built into the code of the program, in which case it's the wipe option or asbestos fingers :-)