When you say you want an EFHW, do you mean with a wideband transformer, or with a choke? You can just wrap a few turns of coax round a ferrite and it would still work as an End Fed, although it would technically be a dipole or Windom. They are multiband and very simple to make:
The technique is also used for the Flowerpot antenna:
https://vk2zoi.com/articles/half-wave-flower-pot/
They can easily be made into dualband antennas.
I haven’t got any data to show, but type 61 is often recommended for higher frequencies. Do you have an antenna analyser? If so, why not get both type 43 and 61 and post the results here. What others have said is true, at higher frequencies you may not need a ferrite at all; an antenna analyser is what you need first and foremost.
73 de OE6FEG
Matt