If you want to keep using your lens then why not either flip the column (if you can) and project onto the floor (or smaller table, etc.)? Or build a table with a removable top? Or mount the enlarger to the wall...?
When I first started printing eons ago I used a 100mm lens for everything, even 35mm. Making a table with removable shelves was far cheaper than buying another lens. Of course lenses are far cheaper these days, and I was young back then.
It just occurred to me too that the Focomat is a condenser enlarger, isn't it? You will probably have light fall off issues related to the condenser light path using a wide lens on it and that might compound the light falloff of the lens.