FWIW they do sell the bench individually for $200 on their site. Otherwise, yes, you nailed it - nothing special IMO save for the single shorter leg. Something *like* this - with adjustable height legs per side - would seemingly work (though YMMV): https://www.amazon.com/Strength-Training-Adjustable-Workout-Capacity/dp/B0B49SK6ND/ref=sr_1_11
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Only wrinkle is they've mentioned a new bench that would support pull downs / rows in the future. Not clear if that'll require an all new purchase (likely) or if it would have a retrofit option for the existing bench (doubtful, but one can hope). No timing announced unfortunately.