No idea what the headtube angle is, geo charts are non existent and I'd have no idea how to ensure it myself.
My thinking was that the a2c would be similar between a long travel 26er for and a short travel 29er fork this keeping the bb height etc where it needs to be.
Your concern is pedal strike + rideable terrain limitation by fitting a shorter fork. #dontknowwhatimtalkingabout
Out of interest - What's the headtube angle fitted with the correct fork? (if it's <68° I may have a point).