I guess that indeed you can convert a v1 to a v2 with a bit of effort, but IMHO it’s not worth the trouble. Why not follow the path others have taken and create an additional outside fan? There are lots of examples, this one: 3DP Part Cooling Fan 5015 Replacement for Gen 1 extruder - #341 by macdylan seems to be the most popular currently, but there are several others in the same thread.