Chainsaw Repair

A foreign Stihl dealer friend of mine is on an experiment.  He's  getting alot of customers coming in with blown lower con rod bearing failures on MS460/461s.
He and his machine shop friend are rebuilding the cranks with Chinese 365/372 roller bearings . Now he wants to try using the Husqvarna's connecting rods in the Stihls too, only trouble their 3mm longer.
He's  making up a aluminium spacer plate sandwiched between 2 cylinder gaskets.

Now I have no experience stroking saws, so my question is do any of you guys think this would work?

Is the 460 crank 3 piece design?  Maybe a nightmare if it's two piece. I would be inclined to put known high quality needle cages in after going to that much trouble.

Isn't the stroke determined by the crank? 
If the rod is 3 mm longer then the piston goes up into the cylinder 3 mm further but then it goes down into the crankcase 3 mm less.   Will this not affect crankcase pressure? 

Joe was saying Stihl 460/461 crank assemblies in his area are going for $250.
He claims he found a supplier selling Chinese 365/372 crank assemblies for $20 each. He's using the roller bearings and pins to rebuild the Stihl cranks. He's experimenting to use the Husky rods too.

Thanks Ed , I was kind of thinking the same thing.
Do you think raising the cylinder 3mm would make the longer rod work in the 460/461?