Add simple recipes to the WEL and HWP to convert 1 HE3 into 1 HE with no/minimal time cost.
HE3 is functionally identical to HE (HE4) for the purposes of chemistry, so it should be usable in all circumstances that HE can be used. At the moment, that’s only the WEL and HWP. Since HE3 is needed for fusion processes and not HE4, you cannot convert in the other direction. While this would only be used rarely, it would be a sensible and nifty inclusion for rare circumstances where welding is desired in areas that have not yet tapped HE, but do have HE3 for making FTL fuel.