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You could add an electric towel rail. They're quite useful because you can put them on a timer and have them work independently of the CH. I put one in a wasted corner in our bathroom and it's ace. In the summer, when the CH never comes on, I can put wet towels (or washing) on it and press the boost button to dry it out.
ffm-
Again, if it ain't easy, I ain't doing it. The original idea was only to swap the rad if it meant a simple swap out. That doesn't look likely what with most towel rads having vertical tails which would require plumbing and floorboard work. Similarly, running in electro-cables will require much more work than I am willing to outlay just to have toasty towels.
99.9% sure we'll just bung a ladder rack/rail on the wall above the current rad.
stevo_com
Floor space is a premium but there is a whole blank wall above the existing rad that would happily take a rack (or tall towel rad if a suitable side entry valve one exists).