Those pictured are the steel rims, was that the intention?
I share the belief that a catastrophic impact that would destroy an alloy wheel intended for 4WD use would typically also damage a steel equivalent beyond further use, emphasising this is pure speculation as side-by-side testing is difficult.
As you say, the difference being that a steel rim with either inboard or outboard rim damage within reason can be dealt with trail side while equivalently minor damage to an alloy wheel (eg a crack to the inboard rim only) wants a TIG/MIG welder which might not be to hand.
Even minor cracking of the outboard rim or a spoke is a structural failure on an alloy and is to my knowledge irreparable... but I stress I've only ever seen it happen on SUVs. I presume Ineos alloys will be suitably robust.
I see the ADF/Army G-Wagon fleet operate alloys and carry a single spare... Bundeswehr G-Wagen versions have steel beadlock type things like the Tonka truck at bottom.
View attachment 7795459View attachment 7795460