I wanted to build a 26-38 crankset using my unused 74/110mm bcd cranks. After searching for some time, i found that those sizes are not common or cheap. I ended up using 64/104mm bcd.

28-30 and 34-36 are not common in 74/110mm.

Since you are using 7 speed freewheel, i assume you have a 14t small cog?

50x14 gives 96.4 gear inch.

May i suggest getting 64/104mm bcd cranks. 28t and 34t chainrings are common. 50t singlespeed/narrow wide chainrings are available. But easier and cheaper to just get 48t.

48x14 gives 92.6 gear inch.