You might try building your own image either with the SDK or full build chain. Even in a semi-protected situation like an internal-only DHCP server, I wouldn't be comfortable running that old a kernel and version of dnsmasq
Another option is one of the inexpensive (~ US $20) devices in What's your favourite cheap LEDE/OpenWrt device?
I don't own one, and keep trying to find an "excuse" to buy one, but I've been tempted by the GL.iNet devices several times. To be very clear, I don't have any personal experience with them.