Ironically, the biggest problem he might encounter if he does get forced to use a Panzer Soldat is that it is actually possible for being too good to be a problem.
A similar scenario actually plays out in-universe when one of the most skilled pilots in Trails (who normally uses a much higher-spec robot) uses a Panzer Soldat for a mock training battle. At one point he gets in a pinch and naturally falls back to his piloting experience/skill from piloting his superior mech and tries to execute some movement that would be possible in his normal unit but when applied here - while it successfully executes enough for him to dodge the finishing move he was about to suffer he literally overloads the engine doing so and the mech locks up mid-counter attack.
When he gives a report on the incident to what basically amounts to a collection of the top engineers in the Empire, including the one who first built Panzer Soldats, the conclusion reached is that the Soldats simply can't keep up with his reaction time the way his normal unit could. They do actually discuss a means to mitigate the issue in implementing a new system, but it would be a non-trivial engineering feat in-universe to pull off.
But the relevant observation I'd take away here is that the mech game in Trails is new enough that a very real caution to a previously skilled pilot dropping into the setting is that the mass produced mechs there don't appear to have any guard rails against a pilot pushing them farther than they actually can handle. Certainly something that can be worked around once it's a known issue for the pilot, but that brings up the issue that learning the problem probably means rendering a unit completely inoperable and depending on when that happens could be very bad. Not to mention unlike the pilot in question where breaking a mech is merely an "oops" embarrassing moment, it might be harder for someone else not nearly as connected to just get another one LOL.