I don't see anything particularly complicated on hand-assembling a panel of 100 SOT23 transistor plus 100 connectors. That is just 200 components. Way less than some single-unit test PCBs I am used to hand assemble (500 components on a single board).
Quick search turned nothing, so I would go down the route of having a custom PCB panel made, probably it could even be extremely cheap to get assembled using the JLCpcb service.
You could even get custom cable assemblies crimped and prepared. There are cheap enough services for that already available for bargain.