Before the boom of japanese mass market rangefinder cameras with luminous lenses (the early seventies) most european mass market cameras (even the famous Zeiss and al. german P&S) had front lens focusing, and I believe that with rather compact - not very open - few elements - lenses, this kind of focusing should be "rather acceptable" within the range of focusing they allowed.

My Moskva, like the SuperIkonta it copied, uses front lens focusing and yields to my opinion fairly sharp pictures. Idem, my Rodenstock 645 Citonette folder.