It is worth noting that interstellar space has a higher density of hydrogen atoms (about 1 per cubic centimetre) than within a heliopause. So the trick of jumping into an empty hex and ramscooping to gather enough fuel to jump again might work.
The trouble is, assuming you go with M-Drives needing a gravity well to work, they DO NOT WORK in interstellar space, so you'll (technically) need a reaction drive to make the ramscoop actually work. And... you're probably having to burn most of the hydrogen you gather as reaction mass, so it might take a LONG time to gather.
On the other hand, if you build up a decent velocity before you jump (and rule that going fast IS enough to count as "maneuvering"), that might work for collecting.
The High Guard entry doesn't cover it that well, but how it is meant to work in real life is that the faster you go the more you scoop, within limits. Residual velocity built up before jump plus empty hex that has the expected higher hydrogen density seems pretty solid. Although TBH, the High Guard rule seems overly generous to me. Even in interstellar space you need to be scooping at lot of volume; one litre of liquid hydrogen contains 2.36 x 10^26 H2 molecules. At one *atom* per cubic centimetre, you can get 500 H2 molecules per litre of interstellar space, so you'd need something like 4.72 x 10^23 litres of space scooped. The volume would be the area of scoopfield multiplied by the distance travelled; you could work out the time required if you knew the area of the field and the velocity.
4.72 x 10^23 litres are equal to 4.72 x 10^11 cubic kilometres, which is a handier unit for working this out.
As an example, lets argue the scoop field has a diameter of 1000 km, giving an area of 3,141 km2. That would require a distance travelled to scoop ONE litre of liquid hydrogen to be 4.72 x 10^11 km3 divided by 3,141 km2, or around 1.5 x 10^8 km, which is oddly enough very close to 1AU (149,597,870 km).
So... with PERFECT scoop efficiency and a scoop diameter of 1000km in interstellar space where the hydrogen density is several times higher than inside a solar system, each litre of liquid hydrogen requires the scoop to travel the distance between the sun and the earth.
So... take the High Guard version with a grain of salt. There's also the issue that if more than one ship is scooping in a given volume, the yields will be shared between them. That might be an advantage if they're pooling it, but not if they're in competition.