To run peer to peer software it needs to be a computer connected to the Internet 24/7. OP, why don't you write a front end app that can connect to OB without being a peer to peer node? Something you can search and purchase on, without being a store.
If your seller then you should be connected 24/7. But for buyers only it doesnt matter much, so Android version make sence for buyers.
Also for Open Bazar to be succesfull, a lot of people need to use it - and most people are buyers or looking to buy, and selling only rarely (for selling they can use their desktop PC instead).