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That's not really possible. Rust isn't "C++ but better". It has several design decisions that make it not really compatible with C++, e.g. no move constructors & the use of fat pointers.

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The main obstacle to making Rust a "C++ but better" language is arguably the half-baked design of its support for pinned data. (Because "pinned", i.e. location-sensitive objects that can't simply be memcpy'd elsewhere are ubiquitous in idiomatic C/C++.) But there are several language proposals to mitigate this in the future, though for most of these a full transition will require an edition change in order not to break backward-compat.

As for the use of 'fat' vs. 'thin' pointers for dynamic dispatch, a C++-style vtable ptr is just a &'static VTableStruct, where VTableStruct is a dictionary of functions. The anyhow crate is a good example of how you can implement that particular approach.

I think I'd say "it's hard, and would require making some opinionated decisions as to what to convert something to" vs "not possible". The bar is pretty high for "not possible"

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