yes, have any Machine shops in your town?[ that is in trying to do it properly.]
they can clamp the bar upright in a drill press with an appropriate sized drill bit.

Your bar was probably made with a thicker tube wall for safety.
Nitto Mustache bars take bar ends and come in 25.4 and 26" OD centers
26 is commonly a Road Bar Is this a road bar too?, should go in as is .

Nitto Albatross bar, in Chromoly is using a stronger material
so the 22.2 OD is thin wall tubing. 25.4 .. + shim to the larger stem clamp.

you might get away with grinding down the end of the mounting bolt, to fit, inside,
or there is an alternate pod that goes around the outside of the bar ,
so the bar ends go on carbon time trial aero bars.