Changing unit scale?

[Roman Heritage]

Hello all guys! I'm currently playing an ERE campaign on SS 6.4 - and writing an AAR about it. I'm currently at turn 151 or so.
While playing one question came to my mind. Writing an AAR, one often needs spectacular screenshots and the like, and I must say that, in custom battles, large and huge scale units greatly help with the feeling of grandeur and realism in said screenshots.

The fact is that I'm currently playing on Normal scale units, although I do think my PC - Win 8.1, Intel Core I3, 4 Gb Ram - which I know it's poor for gaming but pretty modern for Medieval 2, could handle at least Large units.

Is there a way to change the unit scale in an already started campaign, meaning both already fielded units and going-to-be-fielded ones, perhaps by editing the savegame or stuff like that?

And, as a footnote, would my PC properly handle it?

Thank for your attention, have a nice day and if you've got some spare time check out my AAR, link in the signature

[Gigantus]

Is there a way to change the unit scale in an already started campaign, meaning both already fielded units and going-to-be-fielded ones, perhaps by editing the savegame or stuff like that?

And, as a footnote, would my PC properly handle it?

There is no way I know of editing the save file to have larger unit sizes.
If you have a dedicated graphics card of decent capability then you should be able to have huge unit sizes. You may have frame rate issues in siege battles due to sometimes huge building textures.