Unfortunately, little practical effort has been made towards ABDL pull-ups because Kimberly Clark (Huggies - the company behind Pull-Ups and Goodnites) has an iron grip on many of the patents behind the smooth look and feel of what we imagine when we think of pull-on diapers or trainers.
Patent US8361913B2 - Nonwoven composite containing an apertured elastic film
Patent US8956493B2 - Leg and flap elastic composite for an absorbent article and method of manufacturing same
Patent US9956122B2 - Leg and flap elastic composite for an absorbent article and method of manufacturing same
While Procter and Gamble (Pampers & Luvs) has a share of the market with their Easy Ups training underwear, it's unlikely to ever reach the popularity of Huggies' pull-on products, despite Pampers generally being considered the splurge product among regular tape-on disposable baby diapers.
You may want to check out a product called ConvertUps, but they are definitely made more for function than for form, and that just makes things fit in the waist/hips area. If you have a bigger butt and/or thighs, you still won't get the coverage you'd need for it to function as well as a properly-fitting ABDL diaper. What does exist in the ABDL market as far as pull-ons with designs go tends to lack the aesthetic, capacity, and overall snugness of anything designed for kids. If you want to try what's out there, though, I only know of Rearz Felicity pull up pants and Bambino Cloudee and Skooldoodle slip-ons.