Going from HP UNIX to Solaris isn't a big deal. Downloading x86 and working with it is a good idea. Companies tend to want paid experience, but telling them "That's what I use at home" can cloud people's minds.
I've taken Solaris courses. Seriously not impressed. They tend to teach obscure concepts that you'll never use. The courses are strictly for obtaining Solaris certification and I never worked for a company that cared even slightly about them. All they wanted was hands-on experience.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk