What I would do:
• wait a couple weeks....IF Apple announces new laptops at their WWDC, hopefully recharging will be via USB-C
(then there should be many more battery options than currently with MagSafe)
• get a 12.9" iPad Pro and connect via TwoMonUSB
(four speakers are built into iPad Pro 12.9" or 9.7", but only 9.7" has DCI-P3 gamut)