Any input would be appreciated, i would consider such a venture as long as it falls in legal terms.
If the status of bitcoin in the country is legal and not banned so it won't be considered illegal if it is traded or exchanged or P2P. This is normal and has been happening a long time. If the owner of the shop decides to collect his sales in bitcoin then it should not be a problem. It is owners of business that are suppose to promote bitcoin to a greater extent, like PayPal introduced it already.