1) Can I offer sunni salah?

2) Can I fold my hand as sunni people?

1) According to Aagha e Khamenai you can pray your salat with the niyat of jamat but you have to pray shia Salah.

2) If you feel the need to do Taqaiya.

Taqiyya is to conceal their association with their faith when revealing it would result in danger.