Ping will work with proper routing configuration.
You should have correct routing configuration on WAN router and on this HotSpot router, that will connect your network from WAN side to Linksys.
NAT should help you to redirect specific ports, e.g. it is possible to redirect Telnet, SSH, HTTP traffic to access the Linksys.
E.g. each router uses own port: 60000,60001, so on.
‘ip firewall nat add chain=dstnat dst-port=60000 protocol=tcp action=dst-nat to-address=linksys_1 to-ports=23’
Specify this port on Telnet client, then you should get linksys_1, the same for other routers.