I think babele is my favorite leather for casual straps. Just got one from Delugs with cream stitching for the MFR. Delugs also starting using 316L steel for their buckles. Quite nice. ...
If AS made a few more of your custom creation I’d be a buyer for sure. Best AS design I’ve seen. Also agree about Delugs stepping up their game with the new 316L buckles (and new spring bar design).