This is the tool I referenced in my post about the conversion. They're precision sidecutters. I can't recall what I paid for them, but they were sold under the flex-i-file brand. It's a Canadian abrasive tools company, mostly. They sell other hobby tools as well though. Mostly cutting tools. As you can see this was made in pawkistawn so you can probably find it being sold under a number of brand names. I bought them for precision cutting resin pieces but they work well on hard plastic too.
So what makes these different from other side cutters? The precision is one thing. These cut down to about the profile of a human hair. The other advantage is the cutting angle and profile itself. Rather than coming in at a 45 degree angle like conventional side cutters you come in perpendicular, at like a 90 degree square angle. So you can ride it right up against a flat surface and basically scrape details off of it. You can get into places where other sidecutters can't. I wouldn't use it for really thick pieces though, because of how fine the cutting edge is. That's about the only drawback. Also that you have to put quite a bit more force down to clear a cut on hard plastic because of the nature of the design. You won't be replacing your sidecutters totally. But, it has come in handy in a lot of scenarios. Especially if you want to remove a raised detail off a small part. Think like the cross on the crest on that conversion I just posted with the standard.
Anyways, if you're a tool guy and that sounds like it would be helpful for you I'd recommend them. I use them all the time for cutting from sprues or other cuts that would be awkward with normal side cutters.
Have a good one and a happy Thanksgiving weekend to my fellow leafs