Have you thought about using an external bluetooth keyboard? I tried one when I first got into iPads and never liked it much TBH, kept wanting to look at the iPad & keyboard at the same time. But your needs and/or typing skills may be different.
Another option, no use at all for editing but which might help in other respects, is to use an Apple TV to mirror the iPad onto a big TV screen. I found one on 'price match' in John Lewis recently, sub £50.