Variegated Horse Chestnut

[Rivian]

I found a variegated horse chestnut branch in a hedge. Probably only a 20cm section, maybe 4 or 5 leaves. No pics since I never have my phone with me. I guess I'll add one from the interwebz
Just googled it and there already exists Aesculus hippocastanum 'variegata'
But I think I still want to try and propagate what I found
I own several normal horse chestnuts, I think I will attempt a graft
Best way to go about this in early summer?

 

[Crazy Diamond]

In spring before the buds open I think would be a better time, you can also make cuttings of the variegated branches

 

[Rivian]

In spring before the buds open I think would be a better time, you can also make cuttings of the variegated branches

Have you succeeded with Horse Chestnut cuttings? I've never tried