[parttimepro]

From Wizard of Odds:

Suited blackjack pays 2:1 reduces house edge by 0.57%
6-card charlie by 0.16%

I'll estimate for 678 and 777 rules. Assuming infinite deck, and you hit on 13 or 14 2/3rds of the time, this will happen 1 in 1600 hands. You'll get about 1.1 extra bets, so advantage is .0006%.

Blackjacks happen on 4.7% of hands, so the odds of getting three in a row is 0.0106%. You get 40 bets if this happens, so advantage of 0.42%. The subsequent $1000 for additional blackjacks gives an advantage of 0.04%.

All these rule changes result in a 1.19% change in player advantage, which doesn't overcome the 2% ante. Sorry, this is even worse than regular blackjack.