don't EDP last like a full minute?
As a gx you'd probably also want to use celermine juice, +20 str and luk foods, and probably edp. Celermine is like 7k, str and luk food you can probably get around for 15k each. For 5 minutes you'd probably use 5 edp. Edp is like 25k each. 125k for edp, 37k for genetic foods Rounding it off to 160k zeny per 5 minutes. Easily within the timeframe to kill an mvp.
160k = like 4 acid bombs, or 3 acid bombs + 1 fcp. I'm pretty sure most genes can vomit out 4 acid bombs in like 5 seconds.
Only issue between GX and Genes is that overall i think GX has a higher threshold for cost of gear. I've seen people spend like 1 or 2 billion zeny on 1 piece of GX gear for the "top-tier" stuff. Don't even know how much a +12 glorious katar is suppose to cost, but i swear most GX's i talk to just throw gear in that category around like its suppose to be the baseline stuff.
Genes, most expensive thing you'd get is probably a +9 triple AS red twin sword. Maybe a +9 FAW with EA enchants, but a +9 heroic backpack works as a decent substitute imo.