Welcome to the Forum!
sorry , i hope it is not to late to help you.
I think the 4images CMS ist better as your current page, therefore I would try to integrate the current page in 4images.
it is simple HTML and you find it at "templates / your templates/*.html"
the other way ist, you put a link in your current page to 4images Galery and adjust the template your current page to, style color e.t.c.
mfg Andi