Tunnel Aggregation Dial-up VPN

SPOKE Endpoint:
Has two WAN links (wan1 and wan2) with private IP addresses, requiring NAT traversal.
HUB Endpoint:
Has a single WAN link with a public IP address, no NAT traversal required.
Type: "dynamic Dialup user" (Dynamic PPPoE Connection).
Tunnel Aggregation Requirement:
Merge the two existing IPsec tunnels (from SPOKE to HUB) into a single "IPsec Aggregate" tunnel.

The Spoke can only have one tunnel established online at the same time and cannot have two tunnels established online simultaneously.
May I ask what method can be used to establish them simultaneously and complete the tunnel aggregation?

spoke config：

config vpn ipsec phase1-interface
edit "spoke_test1"
set interface "lan3"
set ike-version 2
set peertype any
set net-device disable
set aggregate-member enable
set proposal aes128-sha256 aes256-sha256 aes128gcm-prfsha256 aes256gcm-prfsha384 chacha20poly1305-prfsha256
set localid "88"
set dpd on-idle
set network-overlay enable
set network-id 88
set remote-gw hub address-xxxxx
set psksecret XXXXXXX
set dpd-retryinterval 60
next
edit "spoke2_test2"
set interface "wan"
set ike-version 2
set peertype any
set net-device disable
set aggregate-member enable
set proposal aes128-sha256 aes256-sha256 aes128gcm-prfsha256 aes256gcm-prfsha384 chacha20poly1305-prfsha256
set localid "99"
set dpd on-idle
set nattraversal disable
set network-overlay enable
set network-id 99
set remote-gw hub address-xxxxx
set psksecret XXXXXXXXXXXX
set dpd-retryinterval 60
next
end

config vpn ipsec phase2-interface
edit "spoke_test1"
set phase1name "spoke_test1"
set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
set auto-negotiate enable
next
edit "spoke2_test2"
set phase1name "spoke2_test2"
set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
set auto-negotiate enable
next
end

HUB config：

config vpn ipsec phase1-interface
edit "hub1_test"
set type dynamic
set interface "v707_3003"
set ike-version 2
set peertype any
set net-device enable
set aggregate-member enable
set proposal aes128-sha256 aes256-sha256 aes128gcm-prfsha256 aes256gcm-prfsha384 chacha20poly1305-prfsha256
set localid "88"
set dpd on-idle
set nattraversal disable
set network-overlay enable
set network-id 88
set psksecret XXXXXXXXXX
set dpd-retryinterval 60
next
end

config vpn ipsec phase1-interface
edit "hub2_test"
set type dynamic
set interface "v707_3003"
set ike-version 2
set peertype any
set net-device enable
set aggregate-member enable
set proposal aes128-sha256 aes256-sha256 aes128gcm-prfsha256 aes256gcm-prfsha384 chacha20poly1305-prfsha256
set localid "99"
set dpd on-idle
set nattraversal disable
set network-overlay enable
set network-id 99
set psksecret XXXXXX
set dpd-retryinterval 60
next
end

config vpn ipsec phase2-interface
edit "hub1_test"
set phase1name "hub1_test"
set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
set keepalive enable
next
end

config vpn ipsec phase2-interface
edit "hub2_test"
set phase1name "hub2_test"
set proposal aes128-sha1 aes256-sha1 aes128-sha256 aes256-sha256 aes128gcm aes256gcm chacha20poly1305
set keepalive enable
next
end