Routing, VPN and firewall

We have a development client website which we can access from office network as you office public address is added to an exception. However, when we have our employee visiting client meeting at client site using their guest wifi they cannot access the website for reference though client access and show the website as they are connected to authorized network not guest wifi.

If is difficult to create IP exception, even, if they are using office VPN their source IP is still client guest network and whatever public IP they have for guest network from ISP for guest network. We cannot ask them to create exception to their guest IP, if it is not assigned static IP or ask them for vpn just for meeting.

One solution I could think is to create remote desktop for out team visiting client. So they could remote in to our remote desktop using VPN and they access the website using the desktop that is in our physical LAN.
Is there any other solution that is more effective for such situation where we cannot request for direction access to client VPN, external trust or change their guest network apart from IP exception, which will probably change in guest network.
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pchettriIT DirectorAsked:
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David Johnson, CD, MVPOwnerCommented:
you could use remote desktop.  I would use a virtual machine that is only powered up for the meeting and set the router to forward the rdp port to that machine. I'd also set that machine to only run internet explorer on startup with the startup folder for IE being the website address. (in the rdp properties).  This does cost you a client license for a pro or higher version.

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pchettriIT DirectorAuthor Commented:
I already have vmware infrastructure but not VDI, however, I was thinking about the possibility of creating thinapps so it will actually run from that internal desktop but launches directly from IE seamlessly without giving them the RDP feel
pchettriIT DirectorAuthor Commented:
Looks like I can publish IE remote app using windows 2012 server and publish in MAC using http://whitman.syr.edu/current-students/technology/remoteapp/remoteappmac.aspx
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