you could make a so-8 adapter pcb to an 5 pins inline pcb (single row pinout) ??
Sure; wouldn't be more than a few moments at say EasyEda. You could even make it 6×4 pins, so it sits at the edge of a breadboard, takes power from the power rail, and exposes all six pins on the breadboard, while only taking up one row of pins. Or 5×4; I'd only need to know what's a typical pinout. Perhaps one pinout on one side, and another on the other?
Here is a practical example (in public domain):
A dual SN74LVC8T245 voltage level shifter to sit next to a breadboard. There are a total of 16 unidirectional lines, with two slide switches to select the direction of each group of eight signals. Each side has a separate VCC, which can be anything between 1.65V and 5.5V. The data pins are on 0.1" pitch, and one can solder either a flat cable (8 lines out of a 10-pin rainbow cable, for example), male headers, or female headers to it.
I am thinking a smaller variant with fixed signal directions, but completely isolated using a digital isolator (ADuM, Si86xx, ISO76xx) separately powered via two isolated DC-DC modules (say, using an USB connector, for use with power banks) would be even more useful. The modules are needed because the isolators often require a 3.3V or 5V supply; two are needed, so that the two sides' grounds are completely separate. This would be useful when playing with motor controllers. Needs thinking.