That's it right there. I change my belts before they go bad, and the old ones go in the trunk w/ the spare tire for just such an occasion.

Edit: Also as one who used to sell those link belts, they are:

Hugely more expensive than regular V belts, they were $1/inch when I sold them several years ago and I imagine they've only gone up.

Not flexible/stretchable AND difficult to link up. You will need some way to adjust tension on them, there's no way you're going to link them up and then slip them over the pulleys while still having them be tight enough to do any good when you're done. Nor will you be linking them up under tension.

Not tolerant of high RPM use.

In addition, though not applicable to the application discussed, they also:

Won't transmit as much power as normal V belts, both less contact area and a less sticky compound.

Don't last as long as a normal V belt.

If I was stuck in the middle of nowhere with an alternator to bypass and several feet of link belt handy, you betcha I'd make a go of it, but I really like the shoe laces idea.

The only things I sold link belts for were situations where some dumbass had designed a piece of machinery with literally no way to get a continuous loop of belt on there, or someone line down who just needed ANYTHING to get them moving again and no one in town had the right size in a regular V belt. Usually that only happened once, as we recommended they order a replacement V belt then, and then a spare or three to throw on the shelf as well.

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617 swapped Toyota Pickup, 22-24 MPG, 50k miles on swap