Nice flow-formed wheels at reasonable prices can be had in the 22 lb / 10 kg range. I saved 40+ pounds of unsprung weight from my '22 by immediately swapping the rims. If primarily driving on the street, they're a nice sweet spot between cast and forged. If tracking often, I'd gravitate to the latter.
The only issue, if you want to go with the DH 10.5 front you will have to go custom increasing the cost exponentially. I would probably just live with a 10" wide wheel with a 295/30/19 up front and a 315/30/19 out back.