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Can I use a Transit Gateway with Direct Connect?

In the near future, yes, that will be a great option:

Transit_Gateway_-_Direct_Connect_-_future.png

Refer to:  AWS Transit Gateway

Unfortunately, that feature in not yet available in Sydney (Transit Gateway to Direct Connect integration).

Until it is available, the following architecture may be suitable, using a Transit Gateway for inter-VPC connectivity, plus a Direct Connect Gateway. Subject to these limitations:

Transit_and_Direct_Connect_Gateway_-_interim.jpg