I added a Stromberg-Carlson folding step to my Lexington, for the same reason as you---too high an entry step. Mine worked out perfectly, and was very easy to add.
You can find the info and photo's of mine in the Lexington forum, June 13 2014 posting.
Not knowing your exact set up, don't know if this will work, but it gives you an idea'
Grumpy
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