Advise foreign Registrar .com the most straightforward procedure for domain transfer?

godaddy.com no problem with the transfer (but IMHO the interface is overloaded with them)

yuzayu name.com...

Use the services gandi.net happy with everything.
For domains transferred to them, no problems. On the contrary did not try, so nothing concrete can not say :)
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https://www.gandi.net/domain/transfer/?lang=en

For me, the easiest way is evo.ru-tld.ru
They called it a transfer domain (https://evo.ru-tld.ru/transfer)
To initiate a domain transfer, You need to know the current Registrar of the domain secret code (different registrars it may be called differently: auth-code, epp domain code, secret authorization code).
After You get the necessary data, add them to the appropriate form.
If the domain is one of EvoNames reseller Registrar, domain transfer inside the panel is by performing a "push".
More information about the domain transfer process you can get on the website of ICANN , and especially in the document: "Policy on transfer of registrations between registrars".