That forging (could be a casting...I didn’t look at the link) needs every machining process done to it, including the flange and snout.
You have to find a crank grinder with the skill to do it, will do a one off one time deal and then he has to WANT to do it. Those ain’t easy to find. I looked into that and the only one I could find to do it was Marine Crankshaft, and he wasn’t all that enthusiastic about it.
His exact words were “unless you need some oddball stroke to get into a class what you want is certainly cost prohibitive”.
I think he was at 800 bucks on the low side and a grand on the high side.