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That's the thing, this will be a secondary, very specific sack barrow. I already have a big, beefy one that I use for all sorts of stuff. I'd just like something less bulky for when I just need to transport this specific thing. The obvious option is of course to buy a cargo bike and not have to worry about the easiest way to transport my cymbals on public transport at all.
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this will be a secondary, very specific sack barrow
Then do as @Jonny69 suggests; get the cheap Argos one and take it back when it breaks.
It's £35 at https://www.vonhaus.com/vh_en/90kg-folding-sack-truck
Once you have a decent sack barrow, you will suddenly find a lot of uses for it.