dnsmasq has all grown up since last time I looked at the manpage, but
won't this do what you're seeking?
*S, --local,
--server=[/[<domain>]/[domain/]][<ipaddr>[#<port>][@<source>[#<port>]]]*
Specify IP address of upstream servers directly. Setting this flag
does not suppress reading of /etc/resolv.conf, use -R to do that. If
one or more optional domains are given, that server is used only for
those domains and they are queried only using the specified server.
This is intended for private nameservers: if you have a nameserver
on your network which deals with names of the form
xxx.internal.thekelleys.org.uk at 192.168.1.1 then giving the flag
*-S /internal.thekelleys.org.uk/192.168.1.1 * will send all queries
for internal machines to that nameserver, everything else will go to
the servers in /etc/resolv.conf. An empty domain specification, *//
* has the special meaning of "unqualified names only" ie names
without any dots in them. A non-standard port may be specified as
part of the IP address using a # character. More than one -S flag is
allowed, with repeated domain or ipaddr parts as required.
Also permitted is a -S flag which gives a domain but no IP address;
this tells dnsmasq that a domain is local and it may answer queries
from /etc/hosts or DHCP but should never forward queries on that
domain to any upstream servers. *local* is a synonym for *server* to
make configuration files clearer in this case.
The optional second IP address after the @ character tells dnsmasq
how to set the source address of the queries to this nameserver. It
should be an address belonging to the machine on which dnsmasq is
running otherwise this server line will be logged and then ignored.
The query-port flag is ignored for any servers which have a source
address specified but the port may be specified directly as part of
the source address.
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