[en] Future upgrades at Fermilab possibly include installation of a third detector in the Tevatron at the C0 straight section. The front-running contender for this site is currently the BTeV heavy quark program. A significant fraction of proposed BTeV detector R and D calls for installation of a new low-luminosity interaction region at C0 early in Run II. New magnets will not be available during the interim period and any medium β^* IR insert must therefore be designed solely from Tevatron spares. This paper discusses some of the IR optics design issues related specifically to this magnet restriction and, more generally, issues affecting the Tevatron and its operation that will arise with the installation of any low-β^* IR at C0. The results of several attempts (and subsequent failures) to find a viable C0 IR optics solution using existing magnets are presented