Yep...that's the shortest path - I use those on my AT XMERs, with them plugged into an RCA male to RCA female (male end going to the preamp input - remember, I'm using these at the 'receive' end rather than what you will use them for (the 'send' end).

However, it sounds like you are space-challenged (depth of cabinet), so yes...you could use a very short RCA male (perhaps even right-angle?) to 1/4" TS female...plug the AT XMER into that, then plug the gender-bender into its other side (XLR male to XLR male)...and now you can use any garden variety XLR mic cable to go to the amplifier.