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What exactly about it would be unsafe, if the 13A fuse would be the first thing to go wouldn’t this ensure that the garage wiring and everything else would be intact?
Marginal overloads do not usually blow the fuse, but experience shows that they can stress the contacts and connections in sockets etc. Prolonged load just over 13A is a known cause of burnt electrical accessories. The fuse is primarily there to protect against fault conditions, not incorrect usage, although it acts as a backstop to avoid wiring overheating if the plug is overloaded. In the case of the welder, because the load is intermittent, damage is unlikely, but you can't assume that modern accessories made down to a price with withstand even 13A for long.
As it is an inverter welder, you might find that the current is comfortably within 13A on lower output settings. Plugging it into an energy monitor that has a current display mode might confirm, if you can keep the current steady enough. But if the flex is 2.5 sqmm, it may not be possible to make a safe termination into a 13A plug anyway.