You can already buy perfumer's alcohol in bulk. Just standardise everything like vaping products, but in reverse. Fragrance shots, supplied with a label, which go into a generic oversized bottles of perfumer's alcohol.
Could have AS, EDT and EDP varients for the alcohol. The former also containing appropriate ingredients to nourish the skin.
If the concept is legal for vaping then it should be for frags too
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'Perfumers' alcohol isn't always the best. It's usually 50% alcohol* plus water, plus monopropylene glycol (also found in vape juice and smoke machines) and isopropyl myristate to try and use up cheap 'fixatives' and dilute the alcohol to an extent it becomes packing group III rather than PG II (shipping lingo). As a result you could ship more in bulk per box, but that doesn't necessarily mean the recipient will try using a decent enough grade alcohol, or that the 'perfumers' alcohol is a decent enough grade itself. Either way, it still is classed as dangerous goods and should be shipped as so (not that it ever is through eBay).
*it's not difficult to buy 40% alc. Vodka. Both will have not dissimilar evaporative characteristics. You might get more cloudiness with the Vodka on addition of your 'fragrance shot'.
It often uses completely denatured alcohol (CDA) which is less regulated on receipt versus TSDA (trade-specific denatured alcohol). Compositions for both vary, too;
CDA: ~85% Ethanol, ~5% Isopropanol, ~5% Butanone, 1g/1,000L Bitrex, rest is water content.
TSDA-1 (for perfumes, commercially): ~90% Ethanol, ~5% Isopropanol.
The Bitrex
does have a slight smell, the Bitrex definitely has a taste (unbearably bitter). Butanone isn't the nicest stuff either, but it's in relatively low percentages.
The other option, I guess, would be for someone to think of something which would dilute well enough with Vodka - it's often more regulated than CDA/'perfumers' alcohol and can be bought off most shelves.
On the topic of generic fragrance shot in a consignment of alcohol, you'd still need to package, label, mark and ship in accordance with dangerous goods regs, so cost-wise it'd be no different. The major differential is you'd have more packaging to have the big bottle of alcohol
and the little bottle of concentrated fragrance. I'm surprised more 'niche' houses, with fewer outgoings, limit to 30mL which would take them into the realm of Excepted Quantities, but I won't bore you with those details just yet...