  We explore the prospects and benefits of combining the techniques of cavity
optomechanics with efforts to image spins using magnetic resonance force
microscopy (MRFM). In particular, we focus on a common mechanical resonator
used in cavity optomechanics -- high-stress stoichiometric silicon nitride
(Si$_3$N$_4$) membranes. We present experimental work with a trampoline
membrane resonator that has a quality factor above $10^6$ and an order of
magnitude lower mass than a comparable standard membrane resonators. Such
high-stress resonators are on a trajectory to reach 0.1
$\rm{aN}/\sqrt{\rm{Hz}}$ force sensitivities at MHz frequencies by using
techniques such as soft clamping and phononic-crystal control of acoustic
radiation in combination with cryogenic cooling. We present a demonstration of
force-detected electron spin resonance of an ensemble at room temperature using
the trampoline resonators functionalized with a magnetic grain. We discuss
prospects for combining such a resonator with an integrated Fabry-Perot cavity
readout at cryogenic temperatures, and provide ideas for future impacts of
membrane cavity optomechanical devices on MRFM of nuclear spins.
