Well, I do see a few problems with your MG34-suggestions. Firstly, the Bipod-Mode would essentially turn the unit in some kind of standard elite-infantry while on the field, providing stronger fire support than most early units while not being vulnerable to flanking. Also, unlike the Gren LMG, you stated that it could be fired while moving, and while you implied that it would rarely hit anything, even a weapon that doesn't hit still supresses targets. Also, the Gren LMG has some decent supression even at longer ranges... What that means for this unit? Well, an early blob of two to three teams would give you a great early infantry advantage as enemy squads, even if they had greater short-range firepower, couldn't afford to get near the blob at all. At long range, the LMG-fire would quickly supress them, while any attempt to get close could be countered by just walking backwards with the LMG-blob, resulting in supression once again. There are some reasons for the ridiculous requirements and costs of wehr-LMGs, i guess.
So, while the idea seems interesting to me, I guess that it doesn't quite fit into tech level one. The team should, at the very least, be imcapable of firing on the move. Other options to prevent them from being OP would be to either reduce their damage and supression or their durability to ridiculous levels (like on coaxial tank MGs or Riflemen), but that would somehow render the entire Bipod-Mode feature useless...
Concerning the other features: The idea of turning the MG into an emplacement is interesting, but doesn't the Ostheer already have such a thing? Stormpioneers can construct something that, if you use the current version of the MG34, could do exactly what you are suggesting, but in a different way, and if you upgrade said emplacement, it becomes a Flak in and for itself (correct me if I'm wrong here). So the only niche for the second dig-in ability would be early AA, and honestly... Why would you ever need that? The earliest aerial units I can think of are those Airborne guys, and even they come at 2 CP and only offer a tiny window of opportunity to kill them with AA, and while a Puma can easily exploit this, a static emplacement can't.
The last suggestion seems pretty cool as well, but given that Ostheer seems to be a lot more reliant on their field HQs than any other faction so far, there seems to be little reason to just make a strategically important building repairable instead of simply getting a HQ there. Also, the only things that can destroy field HQs reasonably fast are heavy artillery units, and when the enemy has those already, repairing becomes slightly suicidal anyway.
So to sum it up, While some of the suggestions for the MG34 are rather interesting, I don't believe that the current state of weapon-team-MGs leaves much to be desired, and the Ostheer will get plentiful LMG34s anyway, so I guess that your ideas aren't too much of a great asset to the game.
And now, I'm too tired too comment on the other two units at all
The Kennel seems funny though, snipers suck if you want to use Wehr Flak36s...