But aren’t you already owning openwrt capable hardware? This netgear thing 
Yes indeed, so you would advise I simply upgrade that router to OpenWRT and I might even not need an AP?
Exactly! What could get wrong (beside turning your $100 into a 
)? 
Jokes aside… Definitely do/try it. Read all the do’s and don’ts about your specific device before flashing and get yourself ready to free that thing 
The most information you need might be actually down here (same same device but different name): 
Good ride and keep us posted 
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Yup, if you can flash OpenWRT on the device you’ve already got, DEFINITELY do that first. Save your money, unless it’s a necessity. THEN consider the inexpensive used hardware market.