Tiagra 4703 74mm bcd, 4 bolt small chainring
I've scoured some distributors and I don't think this exists. There's really only a couple 4-bolt asymmetrical triples out there period, and they haven't been out very long. I don't think you're going to see this anytime soon either, because it would blow past the RD max capacity specs of the applicable groups, which is a non-starter from a manufacturer's perspective. Sadly, these are not the cranks to own if you want freedom to customize your gearing, which is pretty ironic since conventional 110/74 are some of the best of all time for it.