Export group of objects as one object or ...

Hi!
I’m looking right now how to speed-up my process of baking in Substance Painter.
Some of you know that Substance Painter have feature which bakes maps base on mesh names so for example weapon_mag_hp will bake only with weapon_mag_lp.

Problem is that I don’t want to collapse some of my hp which should be baked together - lets say and imagine that i have flat plane of lp model, but hp model have flat plane sub-d with some text on it. Substance Painter is taking object name from *.obj file inside so it’s necessery to have it. I know that while exporting you can pick export object as groups, but Substance Painter isn’t taking this seriously.

Is there anyone who have some tips on that? Maybe a little plugin that will collapse my groups of hp meshes during export only or ant other way around?

Ok, so it looks like naming hp meshes that should be together with _part1, _part2 helps a lot.