There's no clear rule for these shields even in pre-remaster.
But Meteor Shields have in the their description "A meteor shield is made from thin steel and has quick-release straps, allowing for easy, long-distance throws."
I understand this as you are able to unstrap interact action incorporated as part of your throw attack action (still triggering reactions). But I can understand if some GM may interpret this as just a flavor description.
About re-strap. Nothing in the rules set that you need a separated action to strap a shield. I consider that the same interact action used to draw or pick up it already includes strap it. So I also consider that a returning rune is able to re-strap this shield too.
Yet most of this is houserule as I said there's no clear rules to deal with shield straps except from detach and even the "quick-release straps" doesn't say anything mechanically (there's no mention to actions or other gameplay mechanics).
It's something that I hope that designers make more clear in the shield rules in some future faq.