So Danny, you want a hopped up cam?
I guess someone with experience in the welding trade and a 'good' welder could put a dollop on top of each of the cam's lobes. These 'dollops' could then be filed and honed to match one another.
With the piston at TDC a valve may be manually pushed open and the distance of max travel measured. (High rpm extended piston travel must also be taken into account.)
One may also measure the existing valve travel and hone/file the 'dolloped' lobes for an increase in valve travel.
This idea I believe is feasible for a possible performance increase.

Would the extended lobes, even though extended by only several thousandths of an inch, still rotate freely within the cam housing? Would the weld material stand up to frictional punishment?

Now to find someone with the time, patience, and equipment to implement it...

Here on RCU a similar idea was proposed some time ago. It involved changing the fulcrum point of the rocker arms thus effectively increasing their ratio.
One would have to make new rockers with the fulcrum closer to the push rods. The rockers' 'swivel pin'? would also need to moved the same distance toward the rods.
The effect would be the same but the machining more difficult.

Hmmmm. Could one reduce the distance from rocker fulcrum to push rod?

Thoughts?