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05 head has a pinhole between water port and intake runner. Is it fixable?

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I bought my 05 1.5 years ago, rode it 3 times and it started getting hard to start. I assumed it was bad intake valves but the PO told me it had only 8hrs on new valves. I moved, started a family etc and it sat for the last 1.5 years. I finally pulled the head today and the left side intake valve is rusty and I can see a pinhole. The PO ported the head himself and obviously got a little thin on the water port/intake runner. The pinhole is about 3/8-1/2" up from the valve seat.

Is this area usually thin and prone for cutting through? I'm trying to decide if it's weldable or do I buy an OEM 07-08 head to replace it.

Valves are good, only about 8hrs on them.

Do most mx machine shops like MX Time do tig welding?

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you can get some epoxy on the under side of it through the water jackets i have had to do this on some of the dirt track heads it does not afect the cooling .

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