I use Everclear (US liquor store brand of: 95% ethanol, 5% water) to prepare a high conc. solution then dilute 1-mg/mL to 2.5-mg/mL with PG. I know you don't have that, hopefully you can legally get Everclear - 95% ethanol for human consumption, no other source of high-proof alcohol should be used! No drug store ethanol! No HomeDepot alcohol - it's all "denatured" with shit that renders it non-consumable. Bad shit, poisonous but you'd not be able to stomach a single sip. Do Not Try!
Several of the RC benzos currently popular (Flubros, etiz, C-Azo) go into warm (not hot & no flame) 95% ethanol very quickly versus PG which is why I do it the way I do. Speed, and then taste improvement, by dilution with PG. I got sick of taking a few mLs of just everclear... So I decided to try this and it works great. Still taste the alcohol but it doesn't burn SL nearly so much. Uses less PG which I have to order, vs. Everclear I can buy at any liquor store.
TL: Others have reported doing so, a search would get you exact experiences. Use a low concentration, as you suggested, due to the high water content, try the 1-mg/mL with a small amount, say 50-mg and if it won't dissolve after a day, add more vodka, warm gently in good quality glass and mix and wait.
Never cool the glass too fast, you can crack it and lose 100-mg as I did once.