Replacing the remote for an older garage door opener remote?
I purchased a Chamberlain KLIK1U 2 button universal garage door remote a little while back and remember there being a dip switch option. I'm not sure if you can program two dip switch openers to it, but it might be worth a try.

Another option which is the one I had to do is that if you have a button inside the garage that you press to open the door, you can get a pair of Chamberlain 955D receivers. It allows you to use a rolling code remote on the opener. If you used one for each opener, you could get one remote with several buttons and program it.

I hope this helps!