I'm glad someone finally asked the question about the Hurjet engine and a potential embargo.
F404 engine stock piling should start. Put in orders for F404 engines for the amount of initial production that Turkey will need for itself.
We have no idea what the next 5-10 years will look like, before the TF35000 is ready and when potentially an F404/414 class engine can be built from reusing the same technology.
I looked at the alternatives, and in terms of quality and realistic possibility, there aren't too many options to replace the F404. Namely b/c of politics and because many are not as good as the F404 or weren't designed for single engine configurations or their tech is lesser than the F404/F414
EJ200 is probably the closest equivalent. And the most realistic replacement both in terms of performance and the NATO ecosystem.
Snecma M88 the French will likely not export to Turkey, and I don't think Turkey will ask, its also underpowered compared to the EJ200 and F414 and even the F404.
The South Koreans are building an engine for the KF-21 that would fit in this category, but their project is currently on a timeline that is likely going to arrive in the 2030s and Turkey would likely have the TF35000 before the Koreans, and at that point, it makes more sense to wait a few more years and build a Turkish equivalent based on the tech from the TF35000 rather than buy a engine IMO.
After these two then the only other Alternatives are Russia and China with the RD-93 and WS-13/21/19 respectively. The RD-93 is a worse engine and the WS-21 and WS-19 have never been used in a single engine design to my knowledge.
The most sensible option for Turkey seems to be to stockpile F404 engine as many as possible, and strictly for its own use. Spain will likely face less export issues for the F404, and they can procure the F404 for themselves and do the integration of the F404 to the Hurjet in Spain.