Looking for Options/Advice:

I have the AC5400 router installed at home and need to VPN through it to send/receive files between my home office and my corporate office. The firewall at the corporate office is hardened and very few ports are allowed open (these are dangerous times). I get it.  But I need a way to do this. 

I have the OpenVPN service running and working outside the corporate environment - I use it from my laptop when I'm on the road. But work Ops team will not open the desired Port(s) for that option.  I have learned that OpenVPN will work over port 443, but tp-link support says I cannot force the router to use that port as it is reserved. Again - I get it. 

What are my options to get some sort of VPN / Remote Desktop connection from work to home?  

NOTE: MS RDP is not an option. It's just WAY too insecure and risky.

Thanks in advance for any advice or options you can enlighten me with.

- damon