The fragility or otherwise of suspension should be an issue?
If you heat the track correctly it should form around the suspension just fine
International Models Asian, and has been said; Resicast make Universal Carrier track in resin. Personally I have found the AA track is not that great
Modelkasten make the only universal carrier track in indy link but it is RARE. I am always on the look out for it and have so far only acquired two sets. It is OOP and a look on the wants boards on various sites reveals a lot of people are lookig for it. A saved search on ebay may be your best bet
I would be incredible suprised, bowled over stunned in fact, if Fruil manage to make these in white metal. The tracks are the most delicate I have ever seen in 1/35 scale. Even if they could be cast in white metal the hole for the 'pins' would be miniscule and in white metal the links would be prone to bending very easily when you tried to insert the pin
I'm not saying it can't be done, but I look forward to seeing how they achieve it!
With any luck someone close to modelkasten will encourage them to re-release it on the back of the vulcan vickers kits