  We present our exploratory study with the aim of simulating heavy-light
semileptonic form factors as part of the RBC-UKQCD charm (to bottom) physics
programme. We are using a distillation-based setup as a strategy to get
optimised plateaus in semileptonic $D_{(s)}$ and $B_{(s)}$ decays, and compare
our results to form factors obtained from sequential $Z_2$-Wall propagators.
The study is done in a centre-of-mass frame as well as in several moving
frames. We use an $N_f=2+1$ domain wall fermion ensemble with a pion mass of
$340$ MeV, with the aim of extending the study to a variety of other
domain-wall ensembles, including physical-pion mass ensembles.
