I once put strong good quality balloons into the plug hole and blew them up to hold the valves in place. I'm fairly sure it was an Avenger engine if memory serves.
I then cut the end off a proper valve spring compressor and made myself a tool with a lever that I could bolt to the head and press down on to release the colletts.
When I'd finished I squeezed the end of the balloon with fingers and cut the knot off to let it down gently - don't just pop it because it might burst into many pieces and leave some behind in the engine.
Worked for me, might work for you.
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