I've read somewhere I think that some people convert to roller bearings is this viable and how much aggregation is it

Yep it's a viable solution and it's no hassle at all.

Put the corresponding cylinder on TDC, unload the camchain tensioner, take the camshaft sprocket off, remove the stock bushing, fit the 6205 (IIRC) bearing, re-install the sprocket and camchain, re-install the camchain tensioner.

I use single-side-shielded bearings with a metal bearing shield to increase the oil-level in the head, the open side is on the camchain-side as the oil-spray is more than enough to lube it.

Hope this helps
Greg