At first i have to say that Stardock and GPG have (and will have) a hard job balancing Generals not to be too weak themselves, not able to stand ground against Assasins and thier minions not to be too weak/strong. And if you consider that they did a quite good work. If they would make the minions their all and everything, any Assasin would easily kill them and the minions would just vanish. 
Then I have to say that there actually aren’t many people around who really want to play a minion based General. There are for sure some who want to, just like you. But a very few really try because there is quite much micro management to do and the possibility to be good in games without having to command your minions (plus the extra work), killing the enemy yourself, is just way too tempting. I saw a lot of people trying to play with minions, but most of them failed. Up to now i only saw one player (Oak) who got my regard for being that good.
But now to your "idea". Nearly everything you want is allready ingame. Just check the options out. 
There is a key for:
- Toggle Health Bar: Tilt (hit it one time to activate only your Healthbar + your minions, two time to see it for all of your side, three times to see it for everyone in the game iirc)
- Select Soldier (8), Archer (9), Priest (0) and Special (i)
- You can control all your minions at once (M), minions + yourself (N), or only yourself (H)
- You can regroup them, all will run to you (O)
In the Key-Options you can even change the placement if you dislike how it is normally. (like I did)
I hope i was able to help you out.
-ViViDGear