With the current goodprophets HALFOFF
through Feb 28 on DIY, 120 ml of 36 mg/ml unflavored plus a 30ml of the GP USA Mix - Menthol flavoring runs about $16.50. I never used their flavorings, but assuming a typical 10% maximum (high concentration things, like straight liquid menthol, are used down at just a few %, but many things end up more like 10%), that would be good for 133 ml of 32 mg/ml USA Mix - menthol
eliquid (with 17 ml of the flavoring left over). No VG in it, lowish vapor production, but that would likely have pretty solid
throat hit.
Anyhow, if it was me I'd just get some V4L or other company pre-made, dedicated for that hard point. Get settled in before thinking of DIY. (The above was just to give you a feel for the relative cost if you go that route later.)