If I pass the 7000 directly to the employee. The employee's income will increase by 7000 and his chargeable income tax will likewise increase.
Not if the employee immediately turns around and deposits that $7,000 into his/her CPF Special Account (that has at least $7,000 of room below the Full Retirement Sum). The possible tax relief is exactly the same.
And/or the employee could still defer his/her income tax via a Supplementary Retirement Scheme (SRS) contribution. Qualified SRS withdrawals might end up completely Singapore tax free, depending on the account holder's future tax bracket.
IRAS lists a couple other non taxable forms of compensation
here. Notably, group medical insurance (with the benefits provided to all staff) is non taxable, and you've got AMCS possibilities there in addition. I would add that you can throw an office party, and that's often an allowable business expense that's non taxable to the employee. The party must have at least a notional business purchase -- a manager who says a few words about business affairs -- and the benefits must be reasonable in the circumstances. A nice meal is probably OK. For that matter you're certainly allowed to feed employees at the workplace while they're "on the clock." Business trips are generally OK as long as they are for legitimate business purposes. However, the employee is not prohibited from staying longer (at his/her own expense if additional hotel nights -- hotel points can work, of course) or otherwise spending his/her free time enjoying the business destination.
IRAS provides a little related guidance
here on special occasion gifts (in short, up to $200 per legitimate special occasion is generally non taxable). Consult a tax expert before doing anything, of course.