I use a set of Sony earbuds that have hooks that hang them from your ears. I prefer to have both ears supplied with audio. You could cut one of them (ear buds not the ears)off as being redundant if you wanted.

Got them for $11 at Longs Drugs. So whatever you do won't cost much.

If the R2 doesn't receive APCO25 digital transmissions you are likely to be missing some stuff in the future.
My State is on that standard now and the radios are expensive but I'd be hearing less than half the action if I couldn't hear the 800 MHz digital trunked traffic.

Unimogbert