Nanny needed for one half hour per day

So we’re think­ing about what to do for our babysitter-enabled evening this week­end, and we real­ize that what we really want most is to have some­one get our kids ready for bed. The bed­time rou­tine of prod­ding, cajol­ing, and (usu­ally) threat­en­ing the kids into their paja­mas is a bru­tal gaunt­let at the end of a long and tir­ing day. Can we hire a nanny to just get the kids ready for bed, then we’ll come in and sing or read to them? That would be awesome.