The first option would be replacing just the chainrings. I've yet to find replacement 130bcd chainrings that surely have pins and ramps. I found a "Brompton" chainring in 50t that includes a chainwheel guard, but I don't know if it has pins and/or ramps, or what speed chain it's for, or whether "Brompton" means that it won't work with other types of bicycles or not. It says that it fits 130bcd. I'd be really happy if this worked for me, because of it having a chainwheel guard.
new Bromptons have a 130 5 arm spider, you could buy a triple middle, a tripleizer from TA French company with a 2nd bolt circle a 74pcd.. for a 24
You may also put a bashguard on in place of an outer chainring on a triple for a 1 by with a bail out low...
I sold my earlier generation Brompton crank/chainring to someone making a single speed ,
their earlier ones were swaged arm & chainring into one piece..
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