I like the basic ones, The Vandra/Ranger or the The Forester/Scout.
These are closest the the original "Shell" design. They're not the boots they used to be however, few are these days, but I've had Lundhags for 30+ years.
Surly you'd only need to shorten the leg which wouldn't really effect any seems?
Buy a pair or sealand/swedteam/Harkila and get a seems tress to shorten and finish the hem, you may loose any studs, velcro straps or buckles but would that really matter?
Had one Harris Ultralight Bipod for 29 years and another for 10 without a single bit of bother, I bought a Harris copy from someone on here for my sons Air rife, great bit of kit for the money, I'd be hard pushed to go passed them if I needed another.
They seem to be very hit or miss when it comes to being waterproof, I know a lot of keepers who have had them and wouldn't have them again, I was speaking to a Headkeeper mate of mine who got 3 pairs for him and 2 underkeeper, 2 pairs leaked badly the first time they were worn, another...
I lined my Lab bitch with last years championship winner Ftch Harperrig Breac Friday before last.
My bitch is Ftch x Ftw, both parents are fully health tested, and fingers crossed pups should be ready to go in December.
You may want something sooner but let me know if you'd be interested.