I don't think it would be a problem if it can be polished and the rocker sliding surface is good. Fortunately it is on the low pressure side of the spring mechanism. If you have to use it keep the valves adjusted frequently and use oil for classic cars/flat tappet camshafts. These are usually C rated / diesel oils and have a higher ZDDP content (yes I'm aware it isn't as high as it was but some are still over 1000PPM ZDDP off the shelf).

There is a used camshaft on eBay now for $450 USD with some good photos that show similar wear to yours except for the scratches. I'd consider polishing the scratches and trying it.

Good luck and keep us updated!!!

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