Uh, use a larger scale?

glass is glass and it will be heavy. Your best bet is just going to be splitting the recipe in smaller batches in 120 ml ldpe bottles and transferring to a glass bottle. If you are going to be using glass for such large batches you are probably going to want to make sure to get some dark amber ones and probably equipped with a pump.

Ummm. Mix in smaller amounts and combine them... Kinda obvious here

I usually don't go over 240ml when I make my batches for steeping since that's about a month worth of juice for me, but I use the 250ml borosilicate reagent bottles from nic river. They're clear, not amber but sticking the bottle in a box works pretty great for keeping out light. It does not go over 500g when filled.

Mix in flasks, then transfer to bottles. Flasks will be considerably lighter than bottles. You still might want to do it in batches though.

Mix into a light HDPE beaker and then transfer to your bottle of choice. This will also allow you to to agitate your mix better and more easily (f.e. with a milk frother fully submerged, or a magnetic stir).

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In any case, if you're looking to make batches larger than 400ml you will need a scale with higher weight limit. That is, unless you're prepared to deal with the PITA of doing multiple small batches.

I routinely mix 750 ml bottles for a buddy using a 500g scale. I add everything but vg to the bottle. Then I weigh the vg bottle. I keep pouring vg until the vg weight drops to the weight I calculated needs to have left the bottle. Simple. A 1% vg error is undetectable. Heck I bet 5% isn’t either.

As far as needing bottles I save all my 500 ml and 1 liter bottles my nic and vg pg come in and reuse them. I also use large mason jars and store them in a pitch black basement closet. I decided it made sense to use readily available bottles instead of buying expensive Boston round bottles. Mason jars are dirt cheap.

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The 240ml amber glass bottles from Bull City work fine on my LB501: I've got a batch of Prickly Victory (70% VG, 3mg/ml) in one and I just checked, the total weight is about 455g, which means the bottle (including the cap) is about 169g, at which point you could even fill it with straight VG and you'd only be a touch over 470g (again including the cap, so plenty of room for error here).

At that point mixing by volume would probably be easier.

This is a bit of a hacky solution, but it should be good enough for home use purposes.

Put the bottle on the scale, tare, weigh out flavoring, nic, and PG. This should keep you comfortably under 500g. Then, just top it off with VG and shake. A discrepancy of like 5% VG isn't going to be too noticeable.