First, I'd scratch the Briscard HRL, the traktor MUL is going to be doing the same job as the HRL Briscard, only better. I'd narrow it down and focus on two things:
1) Observers for the MUL
2) A good skirmishing/camo presence.
Here's what I'd go with:
Ariadna - Merovingian Rapid Response Army | 17 models
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Combat Group #1

Bruant
(25|1)

Métro
HMG (20|0.5)

Métro
Rifle (8|0)

Métro
Rifle (8|0)

Métro
Lieutenant (8|0)

Zouave
Observer (23|0.5)

Zouave
Observer (23|0.5)

Para-Commando
HMG (32|1)

Dozer
Mul Control (18|0)

Traktor Mul
Uragan (19|1)
Combat Group #2

Chasseur
ADHL (19|0.5)

Chasseur
Observer (22|0)

Chasseur
Minelayer (20|0.5)

Métro
Camo DC (11|0)

Métro
Camo DC (11|0)

Métro
Camo DC (11|0)

Chasseur
Minelayer (20|0.5)
________________________________________________________
298/300 points | 6/6 swc
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Sure, you don't have a sniper rifle, but with some aggressive infiltration with the expendable infiltrating metros, the paracommando with an
HMG and the mis-direction caused by the camo tokens, I don't see it as being too much of a problem. For armored targets, you're going to be relying on the MUL, so make sure braunt's link team does a good job guarding it. That said, you've got a few fail-safes, like the chassuer's
ADHL, and the oberserver zouave's D.E.P.'s. Getting close shouldn't be that much of a problem when half your army is already halfway up the field. If you want another observer, scratch a few of the inflitrating metros and replace theme with a
FO paracommando.