Supporting LAG over two links is not officially supported, so how well it works is unknown. Also, having two PtP links in the same orientation (ala essentially a side by side point to point), you will not be able to run 2xHT40 without some level of interference which will drop the SNR and decrease performance.
Additionally, for Malasia, you are limited to 30dBm max EIRP on the outdoor 5GHz channels, which is 6dB less than what we tested for range in the US. So your max throughput will be significantly lower at 2km than what I listed before.
So chances are you will still be capped below 200Mbps at best, even if you utilize both links. I would look at licensed solutions with larger bandwdith and cleaner airspace, or decrease your throughput requirements to accept the best-base optinos for WiFi, or connect with Fiber or VPN.
Good luck!