Welcome to the forum. If you are willing to consider used kit, you will get better value for money, for example, either of the two scopes quoted below would be suitable and should last for a good few years.
If you are happy with a straight used scope, you couldn't do much better than this older
Nikon fieldscope. The "DS" eyepieces come up for sale and are specifically designed for digiscoping.
I'm afraid that I'm not familiar with newer offerings in this price range, but perhaps this
Hawke may be suitable.
Ideally you would require a scope with a greater than 60mm objective lens, and ED glass if possible to reduce colour fringing. A fixed magnification eyepiece is probably more suitable than a zoom for digiscoping as it will reduce vignetting.
There are numerous adaptors suitable for phone-scoping, here are a couple of budget offerings as well as a more expensive tailored option:
The Dorr SA-1 Universal Smartphone Adapter is ideal for connecting your smartphone to the eyepiece of a spotting scope and making spectacular telephoto shots from a distance.
www.birders-store.co.uk
The new Viking Smartphone Adapter is a quick and easy to use adapter ideal for capturing images with almost any model of smartphone.
www.birders-store.co.uk
PhoneSkope Case for iPhone 11/iPhone XR
www.birders-store.co.uk
Hope this helps!