[exim] pinning MX hosts in the absence of DANE/DNSSEC

Hi all,
I have DNSSEC/DANE validation set up, but there are a number of domains I send to quite a bit that are not DNSSEC-signed. For a small subset of these domains (like gmail.com) I'd like to manually pin the MX hosts. Is there a good way to do this in Exim? Something functionally equivalent to Postfix's smtp_tls_policy_maps option.