Probably an unpopular opinion here but I don’t think it matters at all if the bikes fit the same way. I use my old mountain bike on the trainer, it fits completely differently than my road bike and the trainer measures my wattage waaaay differently than my assiomas but I just go with it. I have one ftp for trainer road and one for the real world. Works out fine for me. Hard is still hard no matter what numbers we label it with.
It’s super nice to have a dedicated bike on the trainer, but I would just buy whatever 54 cm option is cheap and easy and get the fit in the ballpark and comfortable.
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