Hello Tonkadan,
I would use a simple Text/HTML module, configure it to not show its container nor title and include within its contents the following text:
<div style="text-align: center">
<a href="http://www.monportal.com"><img alt="French (Canada)" border="0" src="/images/Flags/fr-CA.gif" /></a>
<a href="http://www.myportal.com"><img alt="English (USA)" border="0" src="/images/Flags/en-US.gif" /></a>
<br />
</div>
Then, you may even modify your skin to be able to place that module wherever you want to.
Of course, I would disable the language selector on both portals or just disable the language that does not correspond to each one. I would also disable the automatic browser language detection for both portals.
HTH.
Saludos,
Alejandro.