If the kids are overwhelming and your w is interested in doing more when they are busy, why not try something different here? Maybe hire a babysitter and either have her put the kids to bed or you two put the kids to bed and then go do something fun.
She wants more time with you. That is HUGE!
Me 41, H 47, M 15 yrs, S11, S13 BD 1: 11/4/14 we work on it; really I pretzel myself BD 2: 3/31/15 H goes down to "dorm room" 8/15: H back to MBR 10/15: H back in dorm room 1/18: H files, now divorced