My first point would be to ask why you are considering the career change? And what is attractive about IT over teaching? I ask these questions for you to look introspectively and make sure this is a move that is good for you.

After that thought process, if you are willing to work long hours, you could consider pursuing freelance work while you teach. This would give you the opportunity to keep your current salary and get experience at the same time. There are a lot of freelancing sites on the internet. (Be sure to check them out and read any fine print of any agreements.) While you could not do the obvious hands on work with the physical equipment, there is a lot of help desk work that can be performed remotely.

Here are some sites that I am familiar with:
• Guru.com
• Odesk.com
• Rentacoder.com
• Elance.com
• Vworker.com
• Scriptlance.com
• Workaholoics.com

You might also investigate any temp agencies you have in your area.