No experience with any of them, but a few things I noted..
the haibike comes with mudguards, lights and a rear rack - you’d need to add these to the Forme if they are things you actually need (or look at a different forme like the Alport HTE Urban model at higher price with them). Adding lights to the Alport HTE would be stand alone lighting, lots of options and many will be better than the built offerings of the hailbike or Gepida. All depends whether you want an integrated solution or stand alone lighting with battery packs? The Forme is also using the older Gen3 Bosch motor, not sure which one the Gepida is using but with the battery and general design I suspect it’ll be gen3 too.
the battery cover of the Alport HTE looks prone to water and dirt ingress without mudguards. Similar cover on the haibike but at least it has the protection of the mudguard.
the design of the Gepida looks a little dated with the external down tube battery pack.
given the designs of the Haibike and Gepida, have you looked at Cube Kathmandu models? 2021 model range still being added to the website, but they did a huge range in 2020 with different battery sizes, and components specs at various price points. ‘One’ is lowest component spec level, rising through Pro to EXC. Some 2021 models starting to appear now..
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also the Giant Fastroad EX Pro, rigid fork, smaller 375wh battery on 2020 models but still gives 50 miles on low assistance settings, and there were some on offer at ca £2.5k at Paul’s Cycles. 2021 version reportedly 500wh but I suspect it will be £3k+ when available.
and...
1. have you actually seen/sat on/ test ridden any of them?
2. what local support do you have?
3. Are these internet distance buys or models in local bike shops to you? (Do not under estimate having a local dealer of the brand ,even if you initially buy elsewhere ).
4. don’t assume that website stock levels are correct, supply has been tight for months and companies struggle to keep website stock positions accurate.