Would it be possible to make a custom probing macro so you can probe from other places rather than bottom left?
Yes it is possible.
Here is the code that I use. Just run it like any other program.
When you get macros you will be able to run it with one of them - but you can run it now if you want.
Be aware this is only for 1/4" bits as it is written. If you want other size bits you have to change 2 lines. Be sure to keep the negative sign if it has one.
Search for these lines:
G92 X 2.253 (Set X offset. CNC Measured x + bit radius = 2.1277 + 0.125)
G92 Y -2.253 (Set Y offset. CNC Measured x + bit radius = 2.1277 + 0.125)
You can make a separate file for each size cutter and save them to different macros eventually.
If someone knows how to add a input box that would stop and ask for a bit size then do the calc. that would make it perfect.